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Investment in Unconsolidated Ventures - Additional Information (Detail) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 USD ($) Venture | Jun. 30, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |
Investment in unconsolidated ventures | $ 10,136 | $ 4,430
Distributions of return on investments and earnings | $ 7,049 | $ 1,923
Equity Method Investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Number of ventures under ownership interest using equity method | Venture | 16 |

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