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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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets                      
Total revenues                 $ 497,638 $ 503,843 $ 513,589
Gross profit $ 106,032 $ 98,763 $ 95,562 $ 97,782 $ 111,628 $ 101,621 $ 94,845 $ 99,100 398,139 407,194 420,442
Long-lived assets 60,053       63,269       60,053 63,269  
Domestic                      
Revenues from External Customers and Long-Lived Assets                      
Total revenues                 287,258 293,251 312,400
Gross profit                 228,310 234,266 254,662
Long-lived assets 49,611       55,355       49,611 55,355  
EMEA                      
Revenues from External Customers and Long-Lived Assets                      
Total revenues                 156,706 154,716 149,792
Gross profit                 126,315 126,296 122,235
Long-lived assets 5,931       5,626       5,931 5,626  
Other Regions                      
Revenues from External Customers and Long-Lived Assets                      
Total revenues                 53,674 55,876 51,397
Gross profit                 43,514 46,632 $ 43,545
Long-lived assets $ 4,511       $ 2,288       $ 4,511 $ 2,288