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Compensation Plans - Expense Recognition of Deferred Compensation (Detail) (Restricted Stock Units (RSUs) [Member], USD $)	Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2013	$ 1,241,235
2014	4,869,157
2015	3,968,016
2016	2,133,488
2017	1,300,810
2018	238,073
Total	$ 13,750,779

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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

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