Average period remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_AverageRemainingMaturityOfForeignCurrencyDerivatives1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Summary Information About Derivatives Not Designated as Hedges (Detail) (Derivatives Not Designated as Hedging Instruments)	12 Months Ended
	Dec. 31, 2013 INR	Dec. 31, 2012 INR	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Derivatives not designated as hedges:
Notional amounts
Weighted exchange	0	0
Weighted average maturity	0 years	0 years
Other assets
Other liabilities