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Long-Term Debt and Notes Payable - Summary of Redemption Prices Expressed as Percentage (Detail)
 12 Months Ended
Dec. 31, 2014
2017 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption prices expressed as percentage 104.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
2018 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption prices expressed as percentage 102.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
2019 and thereafter [Member]  
Debt Instrument Redemption [Line Items]  
Redemption prices expressed as percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember