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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets          
Total revenues $ 129,896 $ 129,536 $ 372,053 $ 386,347  
Gross profit 106,961 104,852 302,194 308,653  
Long-lived assets 75,289   75,289   $ 83,591
Domestic          
Revenues from External Customers and Long-Lived Assets          
Total revenues 82,513 77,837 228,427 242,775  
Gross profit 68,084 62,583 185,052 195,435  
Long-lived assets 70,257   70,257   77,652
EMEA          
Revenues from External Customers and Long-Lived Assets          
Total revenues 34,636 40,450 106,833 109,447  
Gross profit 28,183 32,802 86,131 84,637  
Long-lived assets 3,303   3,303   3,701
Other Regions          
Revenues from External Customers and Long-Lived Assets          
Total revenues 12,747 11,249 36,793 34,125  
Gross profit 10,694 $ 9,467 31,011 $ 28,581  
Long-lived assets $ 1,729   $ 1,729   $ 2,238