| **Financing Arrangements and Fair Value of Financial Instruments - Narrative (Details)**                         |               |             | 1 Months Ended | 3 Months Ended |             |              |              |        |                   |
|------------------------------------------------------------------------------------------------------------------|---------------|-------------|----------------|----------------|-------------|--------------|--------------|--------|-------------------|
||
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Purchases of Convertible Notes                                                                                   |          |        |           |           |        | $ 0          | $ 18,107,000 |   |              |   |   |   |   |
| Loss on extinguishment of debt                                                                                   |          |        |           |           |        | 0            | 790,000      |   |              |   |   |   |   |
| Borrowings on lines of credit                                                                                    |          |        |           |           |        | 69,188,000   | 51,922,000   |   |              |   |   |   |   |
| Letters of credit outstanding, amount                                                                            |          |        |           |           |        | 47,000,000   |         |   |              |   |   |   |   |
| Proceeds from financing obligation                                                                               |          |        |           |           | $ 7,900,000 |         |         |   |              |   |   |   |   |
| Principal amount outstanding                                                                                     |          |        |           | $ 114,991,000  |        | 116,397,000  |         |   |              |   |   |   |   |
| Long-term debt                                                                                                   |          |        |           | 114,803,000    |        | 116,242,000  |         |   |              |   |   |   |   |
| Current debt                                                                                                     |          |        |           | 19,210,000     |        | 20,767,000   |         |   |              |   |   |   |   |
| Restricted cash and cash equivalents, current                                                                    |          |        |           |           |        | 4,800,000    |         |   |              |   |   |   |   |
| Foreign operations                                                                                               |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Current debt                                                                                                     |          |        |           | 11,800,000     |        | 14,500,000   |         |   |              |   |   |   |   |
| Subsequent event | Foreign operations                                                                            |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Long-term debt | £                                                                                          |          |        |           |           |        |         |         |   | £ 11,200,000 |   |   |   |   |
| Revolving credit facility | U.K. Subsidiary                                                                      |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Maximum borrowing capacity                                                                                       |          | $ 8,300,000 |           |           |        |         |         |   |              |   |   | £ 6,000,000 |   |
| Quarterly principal payment                                                                                      |          | 375,000     |           |           |        |         |         |   |              |   |   |   |   |
| Balloon payment                                                                                                  |          | $ 1,500,000 |           |           |        |         |         |   |              |   |   |   |   |
| Long-term debt                                                                                                   |          |        |           |           |        | 5,400,000    |         |   |              |   |   |   |   |
| Revolving credit facility | U.K. Subsidiary | Subsequent event                                                   |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Maximum borrowing capacity                                                                                       |          |        |           |           |        |         |         |   |              | $ 2,600,000 | £ 2,000,000 |   |   |
| Quarterly principal payment | £                                                                             |          |        | £ 350,000 |           |        |         |         |   |              |   |   |   |   |
| Balloon payment | £                                                                                         |          |        |           |           |        |         |         |   |              |   | 2,800,000 |   |   |
| Revolving credit facility | SONIA member | U.K. Subsidiary                                                       |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Basis spread on variable rate                                                                                    |          | 3.50%       |           |           |        |         |         |   |              |   |   |   |   |
| Revolving credit facility | SONIA member | U.K. Subsidiary | Subsequent event                                    |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Basis spread on variable rate                                                                                    |          |        | 3.25%          |           |        |         |         |   |              |   |   |   |   |
| Convertible Notes due 2021                                                                                       |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Purchases of Convertible Notes                                                                                   |          |        |           | 38,600,000     |        |         |         |   |              |   |   |   |   |
| Repurchased face amount                                                                                          |          |        |           |           |        |         | 18,300,000   |   |              |   |   |   |   |
| Cost of repurchase                                                                                               |          |        |           |           |        |         | 18,100,000   |   |              |   |   |   |   |
| Loss on extinguishment of debt                                                                                   |          |        |           |           |        |         | $ 800,000    |   |              |   |   |   |   |
| Convertible Notes due 2021 | Senior notes                                                                        |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Debt instrument, face amount                                                                                     |          |        |           |           |        |         |         |   |              |   |   |   | $ 100,000,000 |
| Interest rate, stated percentage                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   | 4.00% |
| ABL Facility | Revolving credit facility                                                                         |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Maximum borrowing capacity                                                                                       |          |        |           |           |        | 200,000,000  |         |   |              |   |   |   |   |
| Maximum borrowing capacity, option to increase                                                                   |          |        |           |           |        | 275,000,000  |         |   |              |   |   |   |   |
| Borrowings on lines of credit                                                                                    |          |        |           |           |        | 87,900,000   |         |   |              |   |   |   |   |
| Letters of credit outstanding, amount                                                                            |          |        |           |           |        | 1,100,000    |         |   |              |   |   |   |   |
| Current borrowing capacity                                                                                       |          |        |           |           |        | 116,000,000  |         |   |              |   |   |   |   |
| Remaining borrowing capacity                                                                                     |          |        |           |           |        | $ 27,000,000 |         |   |              |   |   |   |   |
| Unused capacity, commitment fee percentage                                                                       |          |        |           |           |        | 0.375%       |         |   |              |   |   |   |   |
| Debt, weighted average interest rate                                                                             |          |        |           |           |        | 1.90%        |         |   |              |   |   |   |   |
| Principal amount outstanding                                                                                     |          |        |           | 86,500,000     |        | $ 87,900,000 |         |   |              |   |   |   |   |
| Long-term debt                                                                                                   |          |        |           | 86,500,000     |        | 87,900,000   |         |   |              |   |   |   |   |
| ABL Facility | Revolving credit facility | Subsequent event                                                      |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Maximum borrowing capacity                                                                                       | $ 175,000,000 |        |           |           |        |         |         |   |              |   |   |   |   |
| Maximum borrowing capacity, option to increase                                                                   | 250,000,000   |        |           |           |        |         |         |   |              |   |   |   |   |
| Borrowings on lines of credit                                                                                    | $ 94,100,000  |        |           |           |        |         |         |   |              |   |   |   |   |
| Debt instrument, term                                                                                            | 5 years       |        |           |           |        |         |         |   |              |   |   |   |   |
| Letters of credit outstanding, amount                                                                            | $ 1,100,000   |        |           |           |        |         |         |   |              |   |   |   |   |
| Current borrowing capacity                                                                                       | 133,500,000   |        |           |           |        |         |         |   |              |   |   |   |   |
| Remaining borrowing capacity                                                                                     | $ 38,400,000  |        |           |           |        |         |         |   |              |   |   |   |   |
| Unused capacity, commitment fee percentage                                                                       | 0.375%        |        |           |           |        |         |         |   |              |   |   |   |   |
| Threshold for commitment fee                                                                                     | 50.00%        |        |           |           |        |         |         |   | 50.00%            |   |   |   |   |
| Average daily unused portion, commitment fee                                                                     | 0.25%         |        |           |           |        |         |         |   | 0.25%             |   |   |   |   |
| Fixed charge coverage ratio                                                                                      |          |        |           |           |        |         |         | 1.00   |              |   |   |   |   |
| Line of credit facility, covenant, minimum, fixed charge leverage ratio                                          |          |        |           |           |        |         |         | 4.00   |              |   |   |   |   |
| ABL Facility | Revolving credit facility | Base Rate | Minimum | Subsequent event                                |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Basis spread on variable rate                                                                                    | 0.50%         |        |           |           |        |         |         |   |              |   |   |   |   |
| ABL Facility | Revolving credit facility | Base Rate | Maximum | Subsequent event                                |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Basis spread on variable rate                                                                                    | 1.00%         |        |           |           |        |         |         |   |              |   |   |   |   |
| ABL Facility | Revolving credit facility | Fed Funds Effective Rate Overnight Index Swap Rate | Subsequent event |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Basis spread on variable rate                                                                                    | 0.50%         |        |           |           |        |         |         |   |              |   |   |   |   |
| ABL Facility | Revolving credit facility | BSBY | Subsequent event                                               |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Basis spread on variable rate                                                                                    | 1.00%         |        |           |           |        |         |         |   |              |   |   |   |   |
| ABL Facility | Revolving credit facility | BSBY | Minimum | Subsequent event                                     |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Basis spread on variable rate                                                                                    | 1.50%         |        |           |           |        |         |         |   |              |   |   |   |   |
| ABL Facility | Revolving credit facility | BSBY | Maximum | Subsequent event                                     |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Basis spread on variable rate                                                                                    | 2.00%         |        |           |           |        |         |         |   |              |   |   |   |   |
| Financing obligations                                                                                            |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Debt, weighted average interest rate                                                                             |          |        |           |           | 5.40%       |         |         |   |              |   |   |   |   |
| Principal amount outstanding                                                                                     |          |        |           | 6,688,000      |        | 5,838,000    |         |   |              |   |   |   |   |
| Long-term debt                                                                                                   |          |        |           | 6,610,000      |        | 5,772,000    |         |   |              |   |   |   |   |
| Term loan | Revolving credit facility                                                                            |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Principal amount outstanding                                                                                     |          |        |           | 6,094,000      |        | 5,443,000    |         |   |              |   |   |   |   |
| Long-term debt                                                                                                   |          |        |           | $ 5,984,000    |        | $ 5,354,000  |         |   |              |   |   |   |   |
| Term loan | Secured Debt | U.K. Subsidiary | Subsequent event                                                    |          |        |           |           |        |         |         |   |              |   |   |   |   |
| **Debt Instrument [Line Items]**                                                                                 |          |        |           |           |        |         |         |   |              |   |   |   |   |
| Debt instrument, face amount                                                                                     |          |        |           |           |        |         |         |   |              | $ 9,100,000 | £ 7,000,000 |   |   |

| X                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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Line of Credit Facility, Maximum Borrowing Capacity, Increased Maximum
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| X                                                                                                                                                                                                                                                                   |
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Line Of Credit Facility, Minimum, Leverage Ratio
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| - Definition
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage, Threshold
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| - Definition
Line of Credit Facility, Unused Capacity, Daily Average, Commitment Fee Percentage
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No definition available.
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| X                                                                                                                                                                                                                                                    |
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| - Definition
Proceeds From Financing Obligation
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| X                                                                                                                                                                                                                                                                                                                                       |
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| - Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Face (par) amount of debt instrument at time of issuance.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| - Definition
Amount of the required periodic payments applied to principal.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value amount of debt instrument that was repurchased.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Face (par) amount of the original debt instrument that was repurchased.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average interest rate of debt outstanding.
+ References
No definition available.
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| - Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.
+ References
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| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
+ References
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| - Definition
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).
+ References
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| - Definition
The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
+ References
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| - Definition
The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.
+ References
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