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Fair Value of Financial Instruments - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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| Carrying Amount [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Interest rate swap agreements (includes short-term component) |
$ 2,192 |
$ 3,126 |
| Estimated Fair Value [Member] |
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Interest rate swap agreements (includes short-term component) |
2,192 |
3,126 |
| Class B Term Loan due 2017 [Member] | Carrying Amount [Member] |
|
|
| Long-term debt: |
|
|
| Term Loan |
212,224 |
214,429 |
| Class B Term Loan due 2017 [Member] | Estimated Fair Value [Member] |
|
|
| Long-term debt: |
|
|
| Term Loan |
206,786 |
214,563 |
| Class C Term Loan due 2018 [Member] | Carrying Amount [Member] |
|
|
| Long-term debt: |
|
|
| Term Loan |
384,150 |
388,050 |
| Class C Term Loan due 2018 [Member] | Estimated Fair Value [Member] |
|
|
| Long-term debt: |
|
|
| Term Loan |
371,905 |
389,020 |
| Notes Payable to Banks and Others [Member] | Carrying Amount [Member] |
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|
| Long-term debt: |
|
|
| Notes payable |
64,634 |
44,023 |
| Notes Payable to Banks and Others [Member] | Estimated Fair Value [Member] |
|
|
| Long-term debt: |
|
|
| Notes payable |
$ 64,634 |
$ 44,023 |