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Income Tax - Reconciliations of Tax Charge (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Net income before income tax expense $ 220,232 $ 226,494 $ 218,471
Net income not subject to taxes (173,298) (81,604) (131,529)
Net income subject to taxes 46,934 144,890 86,942
Amount computed using the standard rate of corporate tax (12,007) (33,083) (16,476)
Adjustments to valuation allowance and uncertain tax position 5,362 14,851 12,830
Permanent and currency differences 4,204 11,507 1,576
Change in tax rate (281) (842) (3,086)
Income tax expense $ (2,722) $ (7,567) $ (5,156)