Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Earnings (Loss) before Income Taxes and Income Tax Expense (Benefit) (Detail)

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Income Taxes - Schedule of Earnings (Loss) before Income Taxes and Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Effective tax rate 17.20% 14.00% 38.80%
Earnings (loss) before income taxes $ 516,005 $ 431,884 $ 384,260
Income tax expense 88,753 60,611 149,156
Domestic [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 4,999 16,597 25,628
Income tax expense 24,887 11,500 113,607
Hong Kong [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 50,131 48,352 17,778
Income tax expense 4,303 8,106 5,030
Peoples Republic of China [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 121,702 89,429 95,668
Income tax expense 30,320 19,595 12,971
Jersey [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 245,561 213,327 198,048
Non-benefited loss operations [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes (7,685) (11,422) (17,350)
Income tax expense 1,184 (3,387) 3,306
Other jurisdictions [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 101,297 75,601 64,488
Income tax expense $ 28,059 $ 24,797 $ 14,242