Subsequent Event - Additional Information (Detail) (Refinancing of Debt)	6 Months Ended
Jun. 30, 2011
Refinancing of Debt
Subsequent Event [Line Items]
Date of refinancing, senior secured credit facility	Jul. 28, 2011

Date of subsequent event occurrence or of indication that subsequent event occurred.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

Name:	us-gaap_SubsequentEventsDate
Namespace Prefix:	us-gaap
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration