Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Income Taxes - Schedule of Earnings (Loss) before Income Taxes and Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes $ 333,497 $ 191,380 $ 82,215
Income tax expense $ 72,450 $ 39,184 $ 21,347
Effective tax rate 21.70% 20.50% 26.00%
Domestic [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes $ 136,725 $ 82,778 $ 38,705
Income tax expense 52,173 32,500 12,807
Canada [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 4,228 6,241 4,091
Income tax expense 1,024 1,572 1,187
Chile [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 2,983 629 9,622
Income tax expense 572 138 1,920
Peoples Republic of China [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 49,028 15,201 6,148
Income tax expense 11,084 1,179 1,646
Jersey [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 123,721 77,555 25,348
Non-benefited loss operations [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes (16,719) (13,021) (15,841)
Income tax expense 164    
Other jurisdictions [Member]      
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]      
Earnings (loss) before income taxes 33,531 21,997 14,142
Income tax expense $ 7,433 $ 3,795 $ 3,787