| **Commitments and Contingencies (Details) (USD $)**                                                                      | 1 Months Ended | 3 Months Ended | 9 Months Ended |        |            |
|--------------------------------------------------------------------------------------------------------------------------|----------------|----------------|----------------|--------|------------|
||
| **Capital expenditures anticipated [Abstract]**                                                                          |           |           |           |   |       |   |   |   |   |
| Anticipated capital expenditures for legacy and acquired properties, minimum                                             |           |           |           |   |       | $ 750,000,000 |   |   |   |
| Anticipated capital expenditures for legacy and acquired properties, maximum                                             |           |           |           |   |       | 775,000,000 |   |   |   |
| **Transactions related to commitments and contingencies [Abstract]**                                                     |           |           |           |   |       |   |   |   |   |
| Number of states of acquired business converted onto legacy financial and human resources systems                        |           |           |           | 13     |       |   |   |   |   |
| Number of states with operating systems converted to legacy systems                                                      |           |           | 9              | 4      |       |   |   |   |   |
| Number of platforms resulting from network and systems integration                                                       |           |           | 1              |   |       |   |   |   |   |
| Operating expenses for integration costs                                                                                 |           | 4,458,000      |           |   | 67,412,000 | 68,204,000 | 100,899,000 |   |   |
| Capital expenditures related to integration activities                                                                   |           |           |           |   |       | 38,768,000 | 62,641,000 |   |   |
| Anticipated operating expenses related to completion of integration and cost savings initiatives                         |           |           |           |   |       | 80,000,000 |   |   |   |
| Anticipated capital expenditures related to completion of integration and cost savings initiatives                       |           | 50,000,000     |           |   |       | 50,000,000 |   |   |   |
| Percentage of households in markets served to have broadband availability (in hundredths)                                |           | 85.00%         |           |   |       | 85.00% |   |   |   |
| Targeted Mbps in markets to be acquired by end of year 2013, minimum (in Mbps)                                           |           | 3              |           |   |       | 3 |   |   |   |
| Targeted Mbps in markets to be acquired by end of year 2015, minimum (in Mbps)                                           |           | 4              |           |   |       | 4 |   |   |   |
| Percentage of households throughout acquired territories with broadband availability in excess of 1 Mbps (in hundredths) |           | 84.00%         |           |   |       | 84.00% |   |   |   |
| Percentage of households throughout acquired Territories with broadband availability in excess of 3 Mbps (in hundredths) |           | 80.00%         |           |   |       | 80.00% |   |   |   |
| Percentage of households throughout acquired Territories with broadband availability in excess of 4 Mbps (in hundredths) |           | 78.00%         |           |   |       | 78.00% |   |   |   |
| Number of state regulatory commissions requiring capital investment commitments                                          |           | 3              |           |   |       | 3 |   |   |   |
| Aggregate amount placed into a cash escrow account                                                                       |           | 115,000,000    |           |   |       | 115,000,000 |   |   |   |
| Amount of letter of credit                                                                                               |           |           |           |   |       |   |   |   | 190,000,000 |
| Aggregate amount of cash in escrow accounts for service quality initiatives in the state of West Virginia                |           | 72,400,000     |           |   |       | 72,400,000 |   |   |   |
| Associated liability related to the cash in escrow account                                                               |           | 47,600,000     |           |   |       | 47,600,000 |   |   |   |
| Liability associated with cash in escrow accounts for service quality initiatives in the state of West Virginia          |           | 200,000        |           |   |       | 200,000 |   |   |   |
| Restricted cash balance held in escrow accounts                                                                          |           | 97,300,000     |           |   |       | 97,300,000 |   |   |   |
| Release of funds from the West Virginia escrow account                                                                   |           | 90,500,000     |           |   |       | 90,500,000 |   | 29,100,000 |   |
| Amount released from escrow in state of Washington                                                                       | 25,600,000     |           |           |   |       |   |   |   |   |
| Letter of Credit - reduced                                                                                               |           | 40,000,000     |           |   |       | 40,000,000 |   |   |   |
| Total commitment under the arrangement, Due in Next Twelve Months                                                        |           | 74,800,000     |           |   |       | 74,800,000 |   |   |   |
| Total commitment under the arrangement, Due in Second Year                                                               |           | 132,000,000    |           |   |       | 132,000,000 |   |   |   |
| Total commitment under the arrangement, Due in Third Year                                                                |           | 141,800,000    |           |   |       | 141,800,000 |   |   |   |
| Total commitment under the arrangement, Due in Fourth Year                                                               |           | 140,800,000    |           |   |       | 140,800,000 |   |   |   |
| Number of vehicles accepted by the company for delivery                                                                  |           | 679            |           |   |       | 679 |   |   |   |
| Additional expected number of vehicles to accept the delivery by next year                                               |           | 3,000          |           |   |       | 3,000 |   |   |   |
| Percentage of expected vehicles to be leased under the program (in hundredths)                                           |           | 50.00%         |           |   |       | 50.00% |   |   |   |
| Minimum lease commitment (in years)                                                                                      |           |           |           |   |       | 1 year |   |   |   |
| Total annual lease expense for all new vehicles expected                                                                 |           | 30,000,000     |           |   |       | 30,000,000 |   |   |   |
| **Vermont Joint Owners consortium related commitments and contingencies [Abstract]**                                     |           |           |           |   |       |   |   |   |   |
| Number of utilities forming the Vermont Joint Owners consortium                                                          |           | 14             |           |   |       | 14 |   |   |   |
| Purchase power obligation (in hundredths)                                                                                |           | 10.00%         |           |   |       | 10.00% |   |   |   |
| Number of years assumed if members of the consortium remained in default for the duration of the contract (in years)     |           | 4 years        |           |   |       | 4 years |   |   |   |
| Undiscounted purchase obligation in connection with default for the duration of the contract                             |           | $ 316,100,000  |           |   |       | $ 316,100,000 |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Acquisition-related costs and integration costs incurred to effect a business combination which costs have been expensed during the period. Acquisition costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees. Integration costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Additional expected number of vehicles to accept the delivery by next year.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate amount of cash in escrow accounts for service quality initiatives in markets served pursuant to obligations or liabilities.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate amount placed into a cash escrow account for capital investment commitments required by state regulatory commissions.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amounts released from escrow to be used for service quality initiatives related in the state of Washington properties.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Associated liability related to the cash in the escrow account
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No definition available.
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| X                                                                                                                                                                  |
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| X                                                                                                                                                                                                                                                                                                                                                                                                |
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| - Definition
Total amount of anticipated capital expenditures related to a business combination including integration costs for a specified period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow towards acquisition and integration related activities. Payment includes finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of letter of credit obtained for capital investment commitments required by state regulatory commissions as of the reporting period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                     |
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| - Definition
Amount of letter of credit reduced for capital investment commitments required by state regulatory commissions as of the reporting period.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Liability associated with cash in escrow accounts for service quality initiatives in the state of West Virginia
+ References
No definition available.
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| X                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum lease commitment in years.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                |
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| - Definition
Number of platforms of the Company resulting from its network and systems integration.
+ References
No definition available.
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| - Definition
Number of state regulatory commissions requiring capital investment commitments.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of states of the Acquired Business the Company converted onto the Company's legacy financial and human resources systems during the period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of states of the Acquired Business with their operating systems converted to the Company's legacy systems during the period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of utilities forming the Vermont Joint Owners consortium with a power purchase agreement with a utility.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of vehicles accepted by the company for delivery.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of years assumed if members of the consortium remained in default for the duration of the contract.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total amount of anticipated operating expenses related to a business combination including integration costs for a specified period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of expected vehicles to be leased under the program (in hundredths).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of households in markets served to have broadband availability and speeds.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of households throughout the acquired Territories with broadband availability in excess of 1 Mbps.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of households throughout the acquired Territories with broadband availability in excess of 3 Mbps.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of households throughout the acquired Territories with broadband availability in excess of 4 Mbps.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of the entity's pro-rata share of a power purchase obligation of a party in default of its obligation to purchase power.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum of the range of capital expenditures anticipated for legacy and acquired properties.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum of the range of capital expenditures anticipated for legacy and acquired properties.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                           |
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| - Definition
Amounts released from escrow to be used for service quality initiatives related to our acquired West Virginia properties.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Targeted minimum megabits per second planned for acquired markets by year 2015.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Targeted minimum megabits per second planned for acquired markets by year 2013.
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No definition available.
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| X                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total annual lease expense for all new vehicles expected.
+ References
No definition available.
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| X                                                                                                                                                                                 |
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| X                                                                                                                                                                                                                                                                                                                                                                            |
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| - Definition
Undiscounted purchase obligation if members of the consortium remained in default for the duration of the contract.
+ References
No definition available.
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| - Definition
The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.
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No definition available.
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| - Definition
Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.
+ References
No definition available.
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| - Definition
Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.
+ References
No definition available.
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