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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation Of Income Taxes [Line Items] |  |  |
Cayman statutory rate | $ 0 | $ 0 | $ 0
Tax on pretax income at statutory rate | 18,765 | 15,727 | 6,788
Tax-exempt income | (906) | (2,573) | (4,325)
Permanent differences | (1,065) | (396) | 1,730
Temporary differences | (330) | (344) | 1,732
Alternative minimum tax | 4 | 1,170 | 2,203
Income tax (10%) on undistributed earnings | 2,460 | 2,491 | 3,396
Net changes in income tax credit | (897) | (899) | 708
Net changes in valuation allowance of deferred income tax assets | 1,621 | 733 | (2,364)
Net operating loss carryforwards | (2,052) | (1,298) | (189)
Liabilities related to unrealized tax benefits | 672 | 91 | (39)
Adjustment of prior years' taxes and others | (23) | 1,399 | 132
Income tax expense | $ 18,249 | $ 16,101 | $ 9,772

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- Definition Reconciliation Of Income Taxes [Line Items] + References No definition available. + Details
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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=6907707&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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