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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
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components Of Income Tax Expense Benefit [Line Items]
Computed tax expense at statutory federal rates	$ 1,536us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	$ 18,678us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations	$ 19,911us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Increase (decrease) in taxes resulting from:
State taxes, net of federal income tax benefit	(11)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,983us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1,947us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Domestic production deduction	420us-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	338us-gaap_IncomeTaxReconciliationOtherReconcilingItems		87us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Other expenses	153us-gaap_IncomeTaxReconciliationOtherAdjustments	1,580us-gaap_IncomeTaxReconciliationOtherAdjustments	332us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense (benefit)	$ (451)us-gaap_IncomeTaxExpenseBenefit	$ 18,916us-gaap_IncomeTaxExpenseBenefit	$ 20,026us-gaap_IncomeTaxExpenseBenefit

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Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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