Leases - Summary of Components of Lease Expenses (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease expense:
Amortization of right-of-use assets	$ 680
Interest on lease liabilities	100
Finance lease expense	780
Operating lease expense	19,825
Variable lease expense	102
Sublease income	(316)
Total lease expense	$ 20,391