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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
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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

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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