Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Asset Derivatives Fair Value	$ 1,810
Current maturities on long-term debt	78,707	$ 38,707
Total long-term debt, net	1,498,839	1,503,609
Liability Derivatives Fair Value		8,455
Other Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Asset Derivatives Fair Value	$ 1,810
Liability Derivatives Fair Value		$ 8,455