Fire Related Gain (Loss) and Insurance Recovery - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
Jul. 15, 2011	Jul. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Fire Related Gain And Insurance Recovery [Line Items]
Settled fire damage claims with its insurance carriers			$ 810,000
Fire related gain			277,000	(109,000)
Estimated insurance recoveries			277,000	533,000
Advance received from the carrier	$ 610,000	$ 200,000

The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake).

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Name:	us-gaap_LossFromCatastrophes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration