Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.19.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Income Taxes [Line Items]        
U.S. federal and state statutory rate 24.90%      
Change in effective tax rate due to adjustment in discrete items $ 2,900 $ 10,500    
Cash and cash equivalents 687,498 $ 718,536 $ 872,237 $ 736,431
Cumulative total earnings 469,500      
Non-US [Member]        
Schedule Of Income Taxes [Line Items]        
Cash and cash equivalents $ 469,500      
Non-US [Member] | Geographic concentration risk [Member] | Cash and Cash Equivalents Geographical Area [Member]        
Schedule Of Income Taxes [Line Items]        
Percentage of cash and cash equivalents 68.30%      
Non-US [Member] | Funds Available For Repatriation [Member]        
Schedule Of Income Taxes [Line Items]        
Cash and cash equivalents $ 212,800      
Minimum [Member]        
Schedule Of Income Taxes [Line Items]        
Effective tax rate, remainder of fiscal year 17.00% 17.00%    
Minimum [Member] | Non-U.S jurisdictions [Member]        
Schedule Of Income Taxes [Line Items]        
Statutory federal rate 0.00%      
Maximum [Member]        
Schedule Of Income Taxes [Line Items]        
Effective tax rate, remainder of fiscal year 20.00% 20.00%    
Maximum [Member] | Non-U.S jurisdictions [Member]        
Schedule Of Income Taxes [Line Items]        
Statutory federal rate 34.60%