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Revenue - Financial Statement Effect of Applying ASC 606 (Balance Sheet) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets    
Receivables, net of allowances $ 273,192 $ 262,845
Recoverable income taxes 7,903 7,921
Prepaid expenses 28,370 23,219
Other current assets 21,488 58,126
Accrued receivables, net 180,197  
Deferred income taxes, net 25,181 66,749
Other noncurrent assets 57,631 36,483
Liabilities    
Deferred revenue 102,333 107,543
Income taxes payable 3,137 9,898
Other current liabilities 58,615 102,904
Deferred income taxes, net 25,171 16,910
Stockholders' equity    
Total stockholders' equity 940,715 $ 764,597
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
Assets    
Receivables, net of allowances 199,145  
Recoverable income taxes 6,375  
Prepaid expenses 29,111  
Other current assets 21,303  
Deferred income taxes, net 66,926  
Other noncurrent assets 41,324  
Liabilities    
Deferred revenue 120,253  
Income taxes payable 2,081  
Other current liabilities 58,850  
Deferred income taxes, net 6,448  
Stockholders' equity    
Total stockholders' equity 712,576  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Assets    
Receivables, net of allowances 74,047  
Recoverable income taxes 1,528  
Prepaid expenses (741)  
Other current assets 185  
Accrued receivables, net 180,197  
Deferred income taxes, net (41,745)  
Other noncurrent assets 16,307  
Liabilities    
Deferred revenue (17,920)  
Income taxes payable 1,056  
Other current liabilities (235)  
Deferred income taxes, net 18,723  
Stockholders' equity    
Total stockholders' equity $ 228,139