Derivative Instruments - Additional Information (Detail) (Foreign Exchange Forward, Maximum)	3 Months Ended
Mar. 31, 2014
Foreign Exchange Forward \| Maximum
Derivative [Line Items]
Term of derivative contracts	90 days

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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