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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

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