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Revenue - Financial Statement Effect of Applying ASC 606 (Balance Sheet) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets        
Receivables, net of allowances $ 348,182 $ 262,845    
Recoverable income taxes 6,686 7,921    
Prepaid expenses 23,277 23,219    
Other current assets 39,830 58,126    
Accrued receivables, net 189,010      
Deferred income taxes, net 27,048 66,749    
Other noncurrent assets 52,145 36,483    
Liabilities        
Deferred revenue 104,843 107,543    
Income taxes payable 5,239 9,898    
Other current liabilities 88,054 102,904    
Deferred income taxes, net 31,715 16,910    
Stockholders' equity        
Total stockholders' equity 1,048,231 $ 764,597 $ 754,917 $ 654,400
Without Application of ASC 606 [Member]        
Assets        
Receivables, net of allowances 272,409      
Recoverable income taxes 13,539      
Prepaid expenses 24,018      
Other current assets 38,717      
Deferred income taxes, net 61,554      
Other noncurrent assets 41,590      
Liabilities        
Deferred revenue 134,565      
Income taxes payable 5,472      
Other current liabilities 88,288      
Deferred income taxes, net 10,178      
Stockholders' equity        
Total stockholders' equity 805,228      
Effect of Change - Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]        
Assets        
Receivables, net of allowances 75,773      
Recoverable income taxes (6,853)      
Prepaid expenses (741)      
Other current assets 1,113      
Accrued receivables, net 189,010      
Deferred income taxes, net (34,506)      
Other noncurrent assets 10,555      
Liabilities        
Deferred revenue (29,722)      
Income taxes payable (233)      
Other current liabilities (234)      
Deferred income taxes, net 21,537      
Stockholders' equity        
Total stockholders' equity $ 243,003