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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
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Mar. 31, 2017 | Jan. 01, 2018
ASU 2017-07 | Cost of Sales |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Reclassification adjustment to other components of net periodic pension and OPEB cost | $ 2.6 |
ASU 2017-07 | Selling, General and Administrative Expenses |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Reclassification adjustment to other components of net periodic pension and OPEB cost | $ 1.5 |
ASU 2016-01 |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Accumulated other comprehensive income related to marketable securities reclassified to beginning retained earnings |  | $ 4.8

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