Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Income Taxes - Schedule of Earnings (Loss) before Income Taxes and Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Effective tax rate 38.80% 20.60% 21.70%
Earnings (loss) before income taxes $ 384,260 $ 359,484 $ 333,497
Income tax expense 149,156 74,125 72,450
Domestic [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 25,628 105,589 136,726
Income tax expense 113,607 44,654 52,173
Peoples Republic of China [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 95,668 72,584 49,027
Income tax expense 12,971 11,720 11,084
Jersey [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 198,048 146,880 123,721
Non-benefited loss operations [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes (17,350) (16,189) (16,719)
Income tax expense 3,306 12 164
Other jurisdictions [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 82,266 50,620 40,742
Income tax expense $ 19,272 $ 17,739 $ 9,029