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Quarterly Results (unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018
Effect Of Fourth Quarter Events [Line Items] |  |  |
Pre-tax expense related to settlement agreement |  |  | $ 45,098
Personnel related expenses | $ 4,000 |  |
Fairborn Acquisition [Member] |  |  |
Effect Of Fourth Quarter Events [Line Items] |  |  |
Transaction related expenses |  | $ 4,400 |
Annual maintenance costs |  | $ 5,000 |
Homebuilder Settlement Agreement [Member] |  |  |
Effect Of Fourth Quarter Events [Line Items] |  |  |
Pre-tax expense related to settlement agreement | $ 6,000 |  |

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