Leases - Schedule of Maturities of Operating Lease Liabilities (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Lease Liabilities Payments Due [Abstract]
2019 (remaining nine months)	$ 39,922
2020	54,912
2021	48,369
2022	37,324
2023	24,170
2024 and thereafter	54,043
Total future lease payments	258,740
Less: Imputed interest	27,025
Present value of future lease payments	231,715
Less: Operating lease liabilities	45,636
Long-term operating lease liabilities	$ 186,079