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Basis of Presentation - Revised Presentation of Previously Issued Financial Statements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net revenues:        
Total net revenues $ 487,152 $ 486,267 $ 1,614,567 $ 1,404,177
Cost of revenues:        
Total cost of revenues 255,292 258,272 844,975 751,052
Products [Member]        
Net revenues:        
Total net revenues 426,255 428,891 1,432,931 1,243,146
Cost of revenues:        
Total cost of revenues 219,311 226,445 747,522 662,985
Services [Member]        
Net revenues:        
Total net revenues 60,897 57,376 181,636 161,031
Cost of revenues:        
Total cost of revenues $ 35,981 31,827 $ 97,453 88,067
As Previously Reported [Member]        
Net revenues:        
Total net revenues   486,267   1,404,177
Cost of revenues:        
Total cost of revenues   258,272   751,052
As Previously Reported [Member] | Products [Member]        
Net revenues:        
Total net revenues   434,710   1,259,582
Cost of revenues:        
Total cost of revenues   225,174   659,538
As Previously Reported [Member] | Services [Member]        
Net revenues:        
Total net revenues   51,557   144,595
Cost of revenues:        
Total cost of revenues   33,098   91,514
Adjustment [Member] | Products [Member]        
Net revenues:        
Total net revenues   (5,819)   (16,436)
Cost of revenues:        
Total cost of revenues   1,271   3,447
Adjustment [Member] | Services [Member]        
Net revenues:        
Total net revenues   5,819   16,436
Cost of revenues:        
Total cost of revenues   $ (1,271)   $ (3,447)