Segment Information (Long-Lived Assets by Geographic Region) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 93,700	$ 96,127
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	81,524	83,342
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	10,220	10,504
Rest of the World
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,956	$ 2,281