Total Revenues Gross Profit and Long Lived Assets Excluding Long Term Deferred Tax Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 110,584	$ 117,737	$ 222,008	$ 233,103
Gross profit	86,595	92,387	173,474	181,580
Long-lived assets	141,439		141,439		$ 143,716
Domestic
Revenues from External Customers and Long-Lived Assets
Total revenues	62,066	67,338	127,555	132,219
Gross profit	48,069	52,994	99,511	102,528
Long-lived assets	118,707		118,707		118,168
EMEA
Revenues from External Customers and Long-Lived Assets
Total revenues	37,478	38,957	72,951	76,632
Gross profit	29,856	30,679	57,032	60,207
Long-lived assets	11,787		11,787		13,636
Other Regions
Revenues from External Customers and Long-Lived Assets
Total revenues	11,040	11,442	21,502	24,252
Gross profit	8,670	$ 8,714	16,931	$ 18,845
Long-lived assets	$ 10,945		$ 10,945		$ 11,912