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Taxation - Reconciliation of Income Tax Expense (Parenthetical) (Detail) (China [Member])
12 Months Ended
Dec. 31, 2014
China [Member]
 
Income Tax Contingency [Line Items]  
Percentage of PRC income tax 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_CN