Restructuring Costs - Additional Information (Details)	Dec. 31, 2011
Restructuring And Related Activities [Abstract]
Reductions in force, percentage of workforce affected	11.00%

Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

No definition available.

Name:	us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedInceptionToDatePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant