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Recently Issued Accounting Pronouncements - Additional Information (Detail) - Accounting Standards Update 2017-07 [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Operating Income (Loss) [Member] |  |
Change in Accounting Estimate [Line Items] |  |
Impact on operating results | $ (4.7) | $ (7.2)
Other Nonoperating Income (Expense) [Member] |  |
Change in Accounting Estimate [Line Items] |  |
Impact on operating results | $ 4.7 | $ 7.2

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