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Summary of Reconciliation of Carrying Amount of Total Equity (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Equity [Line Items]  
Foreign currency translation adjustment, taxes $ 29us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax