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Long-Term Debt (5.125% Senior Notes due 2022) - Additional Information (Detail) - 5.125% Senior Notes Due 2022 [Member] - USD ($) |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 01, 2014 | Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Issued Senior Notes | $ 300,000,000.0 |  |
Debt instrument interest rate | 5.125% | 5.125% | 5.125%
Debt instrument maturity date | Jul. 01, 2022 |  |
Interest on the notes |  | payable semi-annually in arrears on January 1 and July 1 of each year |

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