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Long-Term Debt (6.500% Senior Notes due 2024) - Additional Information (Detail) - 6.500% Senior Notes Due 2024 [Member] - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 16, 2016 | Mar. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Issued Senior Notes | $ 390,000,000.0 |  |
Debt instrument interest rate | 6.50% | 6.50% | 6.50%
Debt instrument maturity date | Mar. 01, 2024 |  |
Interest on the notes |  | Payable semi-annually in arrears on March 1 and September 1 of each year, beginning on September 1, 2016. |

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