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Debt - Additional Information (Detail) - USD ($) $ in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
May 20, 2019 | Feb. 12, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Mortgage loan outstanding balance |  |  | $ 360.5 | $ 364.8
Cash collateral for mortgage loan |  |  | $ 2.9 |
7.25% Senior Unsecured Notes due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on loan | 7.25% | 7.25% |  |
Borrowed amount |  | $ 25.0 |  |
Debt instrument maturity date |  |  | Feb. 15, 2021 |
Debt instrument redeemed date | May 20, 2019 |  | May 20, 2019 |
Notes face value |  | 101.00% |  |

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