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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Components Of Income Tax Expense Benefit [Line Items] |  |  |
Computed tax expense at statutory federal rates | $ 1,536 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | $ 18,678 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | $ 19,911 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Increase (decrease) in taxes resulting from: |  |  |
State taxes, net of federal income tax benefit | (11)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,983 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,947 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Domestic production deduction | 420 us-gaap_IncomeTaxReconciliationDeductions | (1,142)us-gaap_IncomeTaxReconciliationDeductions | (1,661)us-gaap_IncomeTaxReconciliationDeductions
Income tax credits | (728)us-gaap_IncomeTaxReconciliationTaxCredits | (724)us-gaap_IncomeTaxReconciliationTaxCredits | (395)us-gaap_IncomeTaxReconciliationTaxCredits
Foreign tax rate differential | (2,159)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (1,459)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (195)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Subpart F income | 338 us-gaap_IncomeTaxReconciliationOtherReconcilingItems |  | 87 us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Other expenses | 153 us-gaap_IncomeTaxReconciliationOtherAdjustments | 1,580 us-gaap_IncomeTaxReconciliationOtherAdjustments | 332 us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense (benefit) | $ (451)us-gaap_IncomeTaxExpenseBenefit | $ 18,916 us-gaap_IncomeTaxExpenseBenefit | $ 20,026 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from 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 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 2: 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 Reference 3: 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)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 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 Reference 4: 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 + Details
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