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Revenue - Financial Statement Effect of Applying ASC 606 (Balance Sheet) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets    
Receivables, net of allowances $ 279,641 $ 262,845
Recoverable income taxes 8,233 7,921
Prepaid expenses 25,875 23,219
Other current assets 23,244 58,126
Accrued receivables, net 181,832  
Deferred income taxes, net 28,179 66,749
Other noncurrent assets 54,477 36,483
Liabilities    
Deferred revenue 93,668 107,543
Income taxes payable 1,600 9,898
Other current liabilities 60,075 102,904
Deferred income taxes, net 26,372 16,910
Stockholders' equity    
Total stockholders' equity 962,938 $ 764,597
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
Assets    
Receivables, net of allowances 202,829  
Recoverable income taxes 6,711  
Prepaid expenses 26,616  
Other current assets 22,844  
Deferred income taxes, net 67,261  
Other noncurrent assets 40,275  
Liabilities    
Deferred revenue 108,162  
Income taxes payable 153  
Other current liabilities 60,310  
Deferred income taxes, net 6,161  
Stockholders' equity    
Total stockholders' equity 734,925  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Assets    
Receivables, net of allowances 76,812  
Recoverable income taxes 1,522  
Prepaid expenses (741)  
Other current assets 400  
Accrued receivables, net 181,832  
Deferred income taxes, net (39,082)  
Other noncurrent assets 14,202  
Liabilities    
Deferred revenue (14,494)  
Income taxes payable 1,447  
Other current liabilities (235)  
Deferred income taxes, net 20,211  
Stockholders' equity    
Total stockholders' equity $ 228,013