Merger Agreement (Details) (Common Stock [Member], USD $)	Aug. 06, 2012
Tender Offer [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Common stock purchase price	$ 13.00
Second-Step Merger [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Common stock purchase price	$ 13.00

For an acquired entity, price of a single share of a number of saleable stocks of a company.

No definition available.

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant