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Revenue Recognition - Schedule of Accounts Receivable and Deferred Revenue (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue Recognition [Line Items]        
Accounts receivable $ 462,577     $ 327,597
Accounts receivable, Increase/(decrease) 134,801 $ 40,582    
Deferred revenue 503,298     374,365
Deferred revenue 148,468 $ 43,247    
Accounting Standards Update 2014-09 [Member]        
Revenue Recognition [Line Items]        
Accounts receivable     $ 473,400 473,400
Deferred revenue     $ 494,591 494,591
Accounting Standards Update 2014-09 [Member] | Adjustments due to Adoption of ASC 606 [Member]        
Revenue Recognition [Line Items]        
Accounts receivable (91,945)     145,803
Accounts receivable, Increase/(decrease) (10,823)      
Deferred revenue (65,818)     $ 120,226
Deferred revenue $ 8,707