Total Revenues Gross Profit and Long Lived Assets Excluding Long Term Deferred Tax Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 115,366	$ 122,967
Gross profit	89,193	97,782
Long-lived assets	150,949		$ 60,053
Domestic
Revenues from External Customers and Long-Lived Assets
Total revenues	64,881	72,079
Gross profit	49,534	57,051
Long-lived assets	126,956		49,611
EMEA
Revenues from External Customers and Long-Lived Assets
Total revenues	37,675	38,198
Gross profit	29,528	30,515
Long-lived assets	10,476		5,931
Other Regions
Revenues from External Customers and Long-Lived Assets
Total revenues	12,810	12,690
Gross profit	10,131	$ 10,216
Long-lived assets	$ 13,517		$ 4,511