Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Property and equipment, net	$ 602,382		$ 42,000	$ 647,413
Finance lease, right-of-use asset	15,700
Finance lease, amortization of right-of-use asset	$ 700
Impairment charge. Property, Plant, and Equipment		$ 1,200