Derivatives and Hedging Activities - Additional Information (Detail)			9 Months Ended
Sep. 30, 2013 Derivative	Dec. 31, 2012 Derivative	Sep. 30, 2013 Foreign exchange option
Derivative Instruments Gain Loss [Line Items]
Maximum original maturity period of foreign currency forward contracts			12 months
Number of foreign exchange options outstanding	0	0
Number of interest rate and currency swap agreements outstanding	0	0

Maximum amount of time 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_MaximumRemainingMaturityOfForeignCurrencyDerivatives1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration