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Accounting Policies (Comparison of Reported Condensed Consolidated Statement of Operations to the Pro-forma Amounts had the Previous U.S. GAAP Guidance been in Effect) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue $ 580,752 $ 508,940 $ 1,118,408 $ 970,961
Total cost of revenue 248,313 216,225 482,870 420,055
Gross profit 332,439 292,715 635,538 550,906
Income from operations 145,594 122,564 258,638 214,807
Interest expense (8,457) (9,155) (17,731) (17,744)
Interest income 172 1,176 751 2,259
Income before provision for income taxes 137,309 114,585 241,658 199,322
Provision for income taxes 28,629 29,178 43,502 44,857
Net income 108,680 $ 85,407 198,156 $ 154,465
Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 580,752   1,118,408  
Total cost of revenue 248,313   482,870  
Gross profit 332,439   635,538  
Total operating expense 186,845   376,900  
Income from operations 145,594   258,638  
Interest expense (8,457)   (17,731)  
Interest income 172   751  
Income before provision for income taxes 137,309   241,658  
Provision for income taxes 28,629   43,502  
Net income 108,680   198,156  
Previous U.S. GAAP | Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 565,879   1,091,248  
Total cost of revenue 239,491   467,456  
Gross profit 326,388   623,792  
Total operating expense 187,321   377,947  
Income from operations 139,067   245,845  
Interest expense (8,457)   (17,731)  
Interest income 437   1,299  
Income before provision for income taxes 131,047   229,413  
Provision for income taxes 27,107   40,536  
Net income 103,940   188,877  
Attributed to the New Revenue Standard | Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 14,873   27,160  
Total cost of revenue 8,822   15,414  
Gross profit 6,051   11,746  
Total operating expense (476)   (1,047)  
Income from operations 6,527   12,793  
Interest expense 0   0  
Interest income (265)   (548)  
Income before provision for income taxes 6,262   12,245  
Provision for income taxes 1,522   2,966  
Net income $ 4,740   $ 9,279