Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative financial instruments	$ 19,600	$ 628
Current maturities on long-term debt	31,850	14,050
Long-term debt	1,548,893	1,569,400
Other Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative financial instruments	$ 19,600	$ 628