Schedule of Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		$ 377,755	$ 279,821
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets		252,812	209,368
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	[1]	$ 124,943	$ 70,453

[1] As of December 31, 2019 and 2018, long-lived assets attributable to Singapore were $__ million and $19.4 million, respectively.