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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue $ 545,448 $ 491,976 $ 1,663,856 $ 1,462,937
Total cost of revenue 239,805 217,974 722,675 638,029
Gross profit 305,643 274,002 941,181 824,908
Total operating expense 188,293   565,193  
Income from operations 117,350 100,413 375,988 315,220
Interest expense (8,453) (9,764) (26,184) (27,508)
Interest income 142 1,400 893 3,659
Income before provision for income taxes 109,039 92,049 350,697 291,371
Provision for income taxes 15,825 21,535 59,327 66,392
Net income 93,214 $ 70,514 291,370 $ 224,979
Previous U.S. GAAP        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 531,525   1,622,773  
Total cost of revenue 231,277   698,733  
Gross profit 300,248   924,040  
Total operating expense 188,725   566,672  
Income from operations 111,523   357,368  
Interest expense (8,453)   (26,184)  
Interest income 394   1,693  
Income before provision for income taxes 103,464   332,877  
Provision for income taxes 14,642   55,178  
Net income 88,822   277,699  
Attributed to the New Revenue Standard | Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenue 13,923   41,083  
Total cost of revenue 8,528   23,942  
Gross profit 5,395   17,141  
Total operating expense (432)   (1,479)  
Income from operations 5,827   18,620  
Interest expense 0   0  
Interest income (252)   (800)  
Income before provision for income taxes 5,575   17,820  
Provision for income taxes 1,183   4,149  
Net income $ 4,392   $ 13,671