Leases - Summary of Lease Expense (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 3,039
Short-term lease expense	276	[1]
Total lease expense	$ 3,315

[1] Short-term lease expense represents expense related to leases with a contract term of one year or less.