Segment Information (Long-Lived Assets by Geographic Region) (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 91,806	$ 96,127
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	79,767	83,342
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	10,224	10,504
Rest of the World
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,815	$ 2,281