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Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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Debt Instrument [Line Items] |  |
Weighted average rates | 2.72% | 2.43%
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 2.19% | 1.82%
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 4.75% | 3.75%

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