Share Repurchase Program (Additional Information) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
May 31, 2012	Dec. 31, 2012
Share Repurchase Program Disclosure [Abstract]
Common stock share repurchase program, authorized amount	$ 50
Common stock share repurchase program, expiration date	May 23, 2013
Common stock share repurchase program, remaining authorized amount		$ 20.0

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration