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Long-Term Debt - Redemption Price Percentage of Senior Secured Notes (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
2016 [Member]  
Debt Instrument [Line Items]  
Redemption price 103.875%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
2017 [Member]  
Debt Instrument [Line Items]  
Redemption price 101.938%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
2018 and Thereafter [Member]  
Debt Instrument [Line Items]  
Redemption price 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember