Share-Based Compensation - Schedule of Intrinsic Value of Restricted Shares Outstanding (Detail) (Restricted Shares [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic Value of Restricted Shares	$ 47,780	$ 40,222	$ 32,634

Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant