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Noncontrolling Interest - Holders of Convertible Limited Partnership Units in Operating Partnership - Additional Information (Detail) (Noncontrolling Interest)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Noncontrolling Interest
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| Noncontrolling Interest [Line Items] | |||
| Percentage of ownership interest of noncontrolling interest | 25.40% | ||
| Limited partnership units | 7,002,538 | ||
| Limited partnership units, conversion ratio | 1 | ||
| Outstanding stock percent that should be acquired for rights to be exercised | 39.90% | ||
| Limited partnership units convertible in to shares of common stock, eligible for conversion | 720,000 | ||
| Fully converted partnership units and diluted weighted average shares outstanding | 27,330,100 | 26,613,900 | 24,739,700 |