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Investment in Limited Partnerships - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |
Consolidated VIE limited partnership interest | 99.90% |  |
Total assets recorded due to consolidation | $ 0 |  |
Residual interest upon dissolution of the partnership |  | $ 1,000,000 |
Other Assets |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Assets representing the carrying amount of remaining partnership |  |  | $ 800,000
Maximum [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total assets recorded due to consolidation | $ 100,000 | $ 100,000 |

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