Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Name:	us-gaap_UnrecognizedTaxBenefits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			6 Months Ended		3 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Maximum Y	Jun. 30, 2013 Minimum Y	Mar. 31, 2013 New Jersey
Income Taxes [Line Items]
Sale of net operating loss carryforwards					$ 2.4
Cash received from sale of net operating loss carryforwards					2.2
Unrecognized tax benefits	$ 2.7	$ 2.7
State income tax returns examination period, years			5	3