Sublease Payment Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Operating Leased Assets [Line Items]
Operating leases, future minimum sublease rentals payment due	$ 2,685
2012
Operating Leased Assets [Line Items]
Operating leases, future minimum sublease rentals payment due	1,037
2013
Operating Leased Assets [Line Items]
Operating leases, future minimum sublease rentals payment due	1,095
2014
Operating Leased Assets [Line Items]
Operating leases, future minimum sublease rentals payment due	$ 553

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(ii)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant