Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.19.3.a.u2
Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule Of Income Taxes [Line Items]        
Maximum measurement period to complete accounting 1 year      
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit)   $ 89,000,000.0 $ 99,900,000  
Reduction in provisional tax   10,900,000    
U.S. federal and state statutory rate 25.00%      
Income (loss) before income taxes $ 516,005,000 431,884,000 384,260,000  
Income tax expense $ 88,753,000 $ 60,611,000 $ 149,156,000  
Effective tax rate 17.20% 14.00% 38.80%  
Foreign tax benefit $ 63,866,000 $ 49,111,000 $ 35,549,000  
Cash and cash equivalents 824,876,000 872,237,000 736,431,000 $ 718,536,000
Cumulative total earnings 566,400,000      
Increase in valuation allowance 2,900,000      
Increase in unrecognized tax benefits 2,600,000      
Unrecognized tax benefits that would be recorded as reduction in income tax expense if recognized 10,600,000      
Interest and penalties 400,000 200,000 500,000  
Accrued interest and penalties 2,100,000 1,800,000    
Prior year unrecognized tax benefits by result of expiring statutes 842,000 512,000    
Reduction in prior period unrecognized tax benefits 0      
Income Tax Examination [Member]        
Schedule Of Income Taxes [Line Items]        
Reasonably possible decrease in unrecognized tax benefits in next twelve month 900,000      
Non-US [Member]        
Schedule Of Income Taxes [Line Items]        
Cash and cash equivalents $ 566,400,000      
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 68.70%      
Non-US [Member] | Funds Available For Repatriation [Member]        
Schedule Of Income Taxes [Line Items]        
Cash and cash equivalents $ 220,300,000      
Non-U.S jurisdictions [Member]        
Schedule Of Income Taxes [Line Items]        
Income (loss) before income taxes $ 511,000,000.0 511,000,000.0    
Average income tax rate 12.50%      
Income tax expense $ 63,900,000      
Income before income taxes relates to foreign losses 7,600,000      
Foreign tax benefit 0      
Net operating loss carry-forwards 154,000,000.0 121,500,000    
Valuation allowance against deferred tax assets 25,900,000 21,400,000    
U.S Jurisdictions [Member]        
Schedule Of Income Taxes [Line Items]        
Income (loss) before income taxes $ 4,999,000 16,597,000 25,628,000  
Average income tax rate 498.00%      
Income tax expense $ 24,887,000 11,500,000 113,607,000  
Jersey [Member]        
Schedule Of Income Taxes [Line Items]        
Income (loss) before income taxes 245,561,000 213,327,000 198,048,000  
Increase in earnings before income taxes 32,300,000      
Other jurisdictions [Member]        
Schedule Of Income Taxes [Line Items]        
Income (loss) before income taxes 101,297,000 75,601,000 64,488,000  
Income tax expense 28,059,000 24,797,000 $ 14,242,000  
State [Member]        
Schedule Of Income Taxes [Line Items]        
Tax credits due to operating loss carried back 10,500,000 8,900,000    
Net operating loss carry-forwards 31,000,000.0 31,100,000    
Valuation allowance against deferred tax assets $ 0 $ 0    
Tax credit and operating loss carry-forward expiration, description These tax credit and net operating loss carry-forward amounts do not begin to expire until 2023 and 2032, respectively.      
Domestic and Foreign [Member] | Settlement with Taxing Authority [Member]        
Schedule Of Income Taxes [Line Items]        
Reasonably possible decrease in unrecognized tax benefits in next twelve month $ 1,600,000      
Minimum [Member] | Non-U.S jurisdictions [Member]        
Schedule Of Income Taxes [Line Items]        
Statutory federal rate 0.00%      
Minimum [Member] | Other jurisdictions [Member]        
Schedule Of Income Taxes [Line Items]        
Consolidated earnings (loss) before taxes, percent 5.00%      
Maximum [Member] | Non-U.S jurisdictions [Member]        
Schedule Of Income Taxes [Line Items]        
Statutory federal rate 34.60%