Commitments and Contingencies (Details 2) (Securities Class Action (Apollo Institutional Investors Group) [Member])	1 Months Ended
Oct. 31, 2010 Plaintiffs
Securities Class Action (Apollo Institutional Investors Group) [Member]
Loss Contingencies [Line Items]
Number of plaintiffs	3

Number of plaintiffs that have filed claims pertaining to a loss contingency.

No definition available.

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration