Long-Term Debt and Notes Payable - Summary of Redemption Prices Expressed as Percentage (Detail)	6 Months Ended
	Jun. 30, 2014
2017 [Member]
Debt Instrument, Redemption [Line Items]
Redemption prices expressed as percentage	104.00%
2018 [Member]
Debt Instrument, Redemption [Line Items]
Redemption prices expressed as percentage	102.00%
2019 and thereafter [Member]
Debt Instrument, Redemption [Line Items]
Redemption prices expressed as percentage	100.00%