Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Derivative financial instruments	$ 0	$ 71
Liabilities:
Derivative financial instruments	1,625
Long-term obligations	1,663,860	1,662,756
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member]
Assets:
Derivative financial instruments
Liabilities:
Derivative financial instruments
Long-term obligations
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Derivative financial instruments		71
Liabilities:
Derivative financial instruments	1,625
Long-term obligations	1,390,950	1,397,975
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Derivative financial instruments
Liabilities:
Derivative financial instruments
Long-term obligations	$ 272,910	$ 264,781