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Investment in Limited Partnerships - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Consolidated VIE limited partnership interest	99.90%
Maximum [Member]
Variable Interest Entity [Line Items]
Total assets recorded due to consolidation	$ 0.1	$ 0.1

X

- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (bb)



-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685

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- Definition

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.

+ References

No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 50



-Paragraph 5A



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=52262685&loc=SL6759159-111685

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