| **Business Acquisitions, Investments and Redeemable Noncontrolling Interests (Details 1) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 0 Months Ended | 3 Months Ended                                                                                                                                                         | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
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| **Business Acquisition [Line Items]**                                                                                                      |           |           |                                                                                                                                                                   |            |   |
| Business Acquisition, Effective Date of Acquisition                                                                                        |           |           | May        09,         2012                                                                                                                                            |            |   |
| Business Acquisition, Percentage of Voting Interests Acquired                                                                              |           |           | 100.00%                                                                                                                                                                |            |   |
| Business Acquisition, Name of Acquired Entity                                                                                              |           |           | Modular Engineering Company Pty Ltd.                                                                                                                                   |            |   |
| Business Acquisition, Base Purchase Price Excluding Cash Acquired                                                                          |           |           | $ 7,875                                                                                                                                                                |            |   |
| Payments to Acquire Businesses, Gross                                                                                                      |           |           | 5,237                                                                                                                                                                  |            |   |
| Business Acquisition, Description of Acquired Entity                                                                                       |           |           | a manufacturer of pressure vessels, process and storage tanks and other natural gas filtration products and distributor of aftermarket elements                        |            |   |
| Business Combination, Reason for Business Combination                                                                                      |           |           | acquisition of Modular gives the Company first-fit manufacturing capabilities in Western Australia, as well as a platform for aftermarket growth throughout the region |            |   |
| Net sales                                                                                                                                  | 256,271        | 257,264        |                                                                                                                                                                   | 716             |   |
| Operating Income (Loss)                                                                                                                    | 33,815         | 34,312         |                                                                                                                                                                   |            | (711) |
| Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets                                                             |           |           | 2,552                                                                                                                                                                  |            |   |
| Business Acquisition, Purchase Price Allocation, Goodwill Amount                                                                           |           |           | $ 5,339                                                                                                                                                                |            |   |

| X                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Acquisition, Base Purchase Price Excluding Cash Acquired
+ References
No definition available.
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| - Definition
With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information.
+ References
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| - Definition
Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Name of the acquired entity.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of voting equity interests acquired in the business combination.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.
+ References
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| - Definition
Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.
+ References
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| - Definition
This element represents a description of the primary reason for the business combination which may consist of general categories such as top-line growth, synergistic benefits, market share, and diversification and the more detailed factors that might apply.
+ References
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| X                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net result for the period of deducting operating expenses from operating revenues.
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.
+ References
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