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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets                      
Total revenues                 $ 480,735 $ 486,327 $ 497,638
Gross profit $ 110,534 $ 105,672 $ 86,595 $ 86,879 $ 108,895 $ 95,878 $ 92,387 $ 89,193 389,680 386,353 398,139
Long-lived assets 1,186,489       143,716       1,186,489 143,716  
Domestic                      
Revenues from External Customers and Long-Lived Assets                      
Total revenues                 279,220 273,581 287,258
Gross profit                 229,466 216,365 228,310
Long-lived assets 1,165,283       118,168       1,165,283 118,168  
EMEA                      
Revenues from External Customers and Long-Lived Assets                      
Total revenues                 155,478 159,643 156,706
Gross profit                 124,513 126,939 126,315
Long-lived assets 11,441       13,636       11,441 13,636  
Other Regions                      
Revenues from External Customers and Long-Lived Assets                      
Total revenues                 46,037 53,103 53,674
Gross profit                 35,701 43,049 $ 43,514
Long-lived assets $ 9,765       $ 11,912       $ 9,765 $ 11,912