Leases - Schedule of Maturity of Operating Lease Liabilities (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
2019	$ 25,975
2020	30,588
2021	26,243
2022	20,423
2023	19,097
Thereafter	66,194
Total undiscounted lease payments	188,520
Less: imputed interest	(21,500)
Total lease liabilities	$ 167,020