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Beginning Balance, Annual Activity and Ending Balance of each Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,048)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ (1,762)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ (2,250)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income/(loss) before reclassifications	(1,292)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	251us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	(142)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
Amounts reclassified from AOCI	594us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	712us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	721us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
Tax effect	(224)us-gaap_OtherComprehensiveIncomeLossTax	(249)us-gaap_OtherComprehensiveIncomeLossTax	(91)us-gaap_OtherComprehensiveIncomeLossTax
Ending Balance	(1,970)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	(1,048)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	(1,762)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(340)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	(728)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	(886)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
Other comprehensive income/(loss) before reclassifications	(30)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	(75)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	(472)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
Amounts reclassified from AOCI	594us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	712us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	721us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
Tax effect	(224)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	(249)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	(91)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
Ending Balance		(340)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember	(728)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(708)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	(1,034)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	(1,364)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember
Other comprehensive income/(loss) before reclassifications	(1,262)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	326us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	330us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember
Ending Balance	$ (1,970)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	$ (708)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	$ (1,034)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember

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