Earning Per Share - Additional Information (Detail)	9 Months Ended
Sep. 30, 2013
Restricted Stock [Member]
Schedule Of Earnings Per Share [Line Items]
Potentially dilutive securities	134,000
Equity Option [Member]
Schedule Of Earnings Per Share [Line Items]
Potentially dilutive securities	3,101,000

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration