Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Derivative financial instruments	$ 301	$ 3,109
Fair Value, Measurements, Recurring [Member]
Assets:
Derivative financial instruments	301	3,109
Liabilities:
Long-term obligations	1,584,513	1,553,389
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Derivative financial instruments	301	3,109
Liabilities:
Long-term obligations	$ 1,584,513	$ 1,553,389