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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets          
Total revenues $ 123,142 $ 132,940 $ 242,157 $ 256,811  
Gross profit 99,041 107,028 195,233 203,801  
Long-lived assets 79,527   79,527   $ 83,591
Domestic          
Revenues from External Customers and Long-Lived Assets          
Total revenues 73,907 86,003 145,914 164,938  
Gross profit 59,385 70,394 116,968 132,852  
Long-lived assets 74,407   74,407   77,652
EMEA          
Revenues from External Customers and Long-Lived Assets          
Total revenues 36,525 35,248 72,197 68,997  
Gross profit 29,066 26,836 57,948 51,835  
Long-lived assets 3,316   3,316   3,701
Other Regions          
Revenues from External Customers and Long-Lived Assets          
Total revenues 12,710 11,689 24,046 22,876  
Gross profit 10,590 $ 9,798 20,317 $ 19,114  
Long-lived assets $ 1,804   $ 1,804   $ 2,238