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Non-Marketable Investments - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying value of the Company's non-marketable investments	$ 3.9		$ 3.8
Book value of investment	0.6		$ 0.7
Gross distributions received from funds	$ 0.1	$ 1.5
Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Ownership interest of Company	5.00%

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- Definition

Carrying amount of investments in equity method investees and the carrying amount, after adjustment, of cost-method investments.

+ References

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- Definition

Gross income received from cost method investments funds during the period.

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- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ 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 210.5-02.12)



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-Name Accounting Standards Codification



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-SubTopic 20



-Section 50



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-Name Accounting Standards Codification



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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 323



-SubTopic 10



-Section 50



-Paragraph 3



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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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