Shareholders' Equity - Additional Information (Details) (2011 Share Repurchase Program, USD $) In Millions, unless otherwise specified	0 Months Ended
Dec. 09, 2011
2011 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization amount	$ 20.0

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

No definition available.

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