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Fair Value of Financial Instruments - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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| Long-term debt: | ||
| Class B Revolving Credit Facility amount | 132.3 | |
| Class B Term Loan due 2017 [Member] | ||
| Long-term debt: | ||
| Long-term debt, maturity year | 2017 | 2017 |
| Class C Term Loan due 2018 [Member] | ||
| Long-term debt: | ||
| Long-term debt, maturity year | 2018 | 2018 |