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New Financial Accounting Pronouncements - Additional Information (Detail) - ASU 2016-09 [Member] - USD ($) $ in Millions | 9 Months Ended |
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Sep. 30, 2017 | Jan. 01, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Discrete tax benefit | $ 0.4 |
Retained Earnings [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Cumulative effect adjustment to reduce retained earnings |  | $ 0.1

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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