Segment Information - Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	$ 301,865	$ 301,651
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	195,627	195,424
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, Total	$ 106,238	$ 106,227