Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.19.3
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Income Taxes [Line Items]              
U.S. federal and state statutory rate       24.70%      
Change in effective tax rate due to adjustment in discrete tax expense (benefit) $ 900   $ (3,900) $ 3,900 $ (13,100)    
Cash and cash equivalents 824,004   $ 802,771 824,004 $ 802,771 $ 872,237 $ 736,431
Cumulative total earnings 247,300     247,300      
Cumulative income tax expense   $ 1,500          
Non-US [Member]              
Schedule Of Income Taxes [Line Items]              
Cash and cash equivalents 533,600     $ 533,600      
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       64.80%      
Non-US [Member] | Funds Available For Repatriation [Member]              
Schedule Of Income Taxes [Line Items]              
Cash and cash equivalents $ 533,600     $ 533,600      
Minimum [Member]              
Schedule Of Income Taxes [Line Items]              
Effective tax rate, remainder of fiscal year       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       19.00%      
Maximum [Member] | Non-U.S jurisdictions [Member]              
Schedule Of Income Taxes [Line Items]              
Statutory federal rate       34.60%