Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Liabilities:
Derivative financial instruments	$ 19,600	$ 628
Long-term obligations	1,601,287	1,615,635
Significant Other Observable Inputs (Level 2) [Member]
Liabilities:
Derivative financial instruments	19,600	628
Long-term obligations	$ 1,601,287	1,352,438
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Long-term obligations		$ 263,197