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Discontinued Operations and Divestitures (Discontinued Operations) - Additional Information (Detail) - Office | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Dec. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2015
Discontinued Operations and Disposal Groups [Abstract] |  |  |
Discontinued Operations, Number of Operations Sold | 2 | 2 | 2

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