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Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
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3 Months Ended |
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Dec. 31, 2013
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| Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] | |
| Weighted average shares outstanding-diluted | 36,794,215 |
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Operating Partnership Awards Outstanding [Member]
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| Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] | |
| Weighted average shares outstanding-diluted | 7,821 |