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Stockholders’ Equity of the Company and Partners' Capital of the Operating Partnership - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Class of Stock [Line Items] |  |
Conversion of Units / Limited Partner Units to Common Stock / General Partner Units | $ 0 | $ 0
Common stock dividends and Unit distributions | $ 44,283 |
Convertible Common Stock |  |
Class of Stock [Line Items] |  |
Conversion of Units to Common Stock | 11,012 | 175,333
Conversion of Units / Limited Partner Units to Common Stock / General Partner Units | $ 106 | $ 1,697
Common Stock and Operating Partnership Units |  |
Class of Stock [Line Items] |  |
Common stock dividends and Unit distributions | $ 44,283 |

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