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Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail) | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Debt Disclosure [Abstract] |  |
Weighted average rates | 2.04% | 2.55%
Range of effective rates, minimum | 1.65% | 1.87%
Range of effective rates, maximum | 3.25% | 3.25%

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