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Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |
Weighted average rates | 3.08% | 2.72%
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 2.12% | 2.19%
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 5.50% | 4.75%

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