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Nature of Business and Financial Statement Presentation - Additional Information (Detail) - Accounting Standards Update (“ASU”) No. 2015-02 $ in Millions | Mar. 31, 2016 USD ($) Entity | Dec. 31, 2015 USD ($) Entity
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Nature Of Business And Financial Statement Presentation [Line Items] |  |
Number of entities considered VIE | Entity | 3 | 3
Maximum exposure to losses associated with VIEs | $ | $ 415.0 | $ 412.4
Number of entities with debt guarantee | Entity | 1 |
Affiliate debt guarantee | $ | $ 4.7 |

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