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Compensation Plans - Expense Recognition of Deferred Compensation (Detail) (Restricted Stock Units (RSUs), USD $)	Sep. 30, 2014
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2014 (Remaining Period)	$ 1,476,596
2015	4,877,480
2016	2,188,337
2017	1,671,996
2018	939,958
2019	299,377
Total	$ 11,453,744

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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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