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Investment Portfolio - Narrative (Detail)	Sep. 30, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract]
Fair value of investment	$ 87,000,000
Schedule of Trading Securities and Other Trading Assets [Line Items]
Deferred compensation investments	13,369,919
Trading Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Deferred compensation investments	8,900,000
Equity Method Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Deferred compensation investments	$ 4,500,000

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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