Schedule of Future Minimum Lease Payments (Detail) - Accounting Standards Update 2016-02 - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
2019 (remainder)	$ 23,499
2020	31,278
2021	22,836
2022	1,413
2023	878
Thereafter	2,357
Total future minimum lease payments	82,261
Less amount representing interest	(5,911)
Lease liability	$ 76,350	$ 82,900