The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Stockholders' Equity - Additional Information 3 (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2013 Director Stock Plan [Member]	Dec. 31, 2012 Director Stock Plan [Member]	Dec. 31, 2011 Director Stock Plan [Member]	Dec. 31, 2011 2002 Directors Stock Plan [Member]	May 31, 2011 2002 Directors Stock Plan [Member]	Dec. 31, 2013 2002 Directors Stock Plan amended [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for issuance					400,000
Increase number of shares of common stock reserved for issuance under the plan				200,000		200,000
Excess of fair value over share issue price	$ 1.0	$ 1.0	$ 0.7