The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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_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					12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Federal	Mar. 31, 2013 New York	Mar. 31, 2013 Connecticut	Mar. 31, 2013 Pennsylvania	Mar. 31, 2013 New Jersey	Dec. 31, 2012 Minimum	Dec. 31, 2012 Maximum
Income Tax Disclosure [Line Items]
Net operating loss carryforward		$ 10.6
Annual limitation of federal NOLs								1.0	2.2
Expiration date of net operating loss carryforward								2018	2024
Unrecognized income tax benefit	$ 0.7
Number of years for examination			Four	Four	Four	Four	Five