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v3.19.1

Long-Term Debt - Other - Additional Information (Detail) - Promissory Note - Tremont - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Interest rate | 3.00% | 3.00% |
Principal prepayments of note | $ 2.2 | $ 3.7 | $ 1.5
Principal amount of promissory note | $ 19.1 | $ 19.1 |
Debt instrument maturity date |  | Dec. 31, 2023 |

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