Subsequent Events (Details) (Subsequent event, Derivatives designated as hedging instruments, Foreign currency forward contracts) In Thousands, unless otherwise specified		0 Months Ended
Jan. 02, 2013 U.S. Dollar and U.K. Pound Sterling Forward Contract USD ($)	Jan. 02, 2013 U.S. Dollar and U.K. Pound Sterling Forward Contract GBP (£)	Jan. 15, 2013 U.S. Dollar and Indian Rupee Forward Contract USD ($)	Jan. 15, 2013 U.S. Dollar and Indian Rupee Forward Contract INR	Jan. 15, 2013 U.K. Pound Sterling and Indian Rupee Forward Contract GBP (£)	Jan. 15, 2013 U.K. Pound Sterling and Indian Rupee Forward Contract INR
Subsequent Events
Aggregate notional amount of foreign currency forward contracts	$ 4,228	£ 2,620	$ 13,806	789,924	£ 3,606	332,862
Weighted average settlement rate	1.614	1.614	56.48	56.48	91.87	91.87
Foreign currency forward contracts expiration period			24 months	24 months	24 months	24 months

Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Name:	us-gaap_NotionalAmountOfForeignCurrencyDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant