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Reconciliation of Income Tax Expense on Pretax Income at Statutory Rate and Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation Of Income Taxes [Line Items]      
Tax expense at statutory rate of Cayman $ 0 $ 0 $ 0
Differences between Cayman and foreign statutory tax rates 34,415 18,765 15,727
Tax-exempt income (4,648) (906) (2,573)
Permanent differences (7,792) (1,065) (396)
Temporary differences (1,533) (330) (344)
Alternative minimum tax 594 4 1,170
Income tax (10%) on undistributed earnings 5,677 2,460 2,491
Net changes in income tax credit (495) (897) (899)
Net changes in valuation allowance of deferred income tax assets 1,724 1,621 733
Net operating loss carryforwards (1,689) (2,052) (1,298)
Liabilities related to unrealized tax benefits 2,385 672 91
Adjustment of prior years' taxes and others (948) (23) 1,399
Income tax expense $ 27,690 $ 18,249 $ 16,101