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Other Income, Net - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) Parcel | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |
Gain on securities transaction recognized |  |  |  |  | $ 12.6 | $ 0.1
Number of land parecels | Parcel |  |  |  | 2 |  |
Net proceeds |  |  |  |  | 19.5 |
Pre-tax gain on sale of land |  |  |  | $ 11.9 |  |
Tremont |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |
Net proceeds |  |  |  | 18.9 |  |
Promissory Note | Tremont |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |
Principal payment of debt |  | $ 2.2 |  | 2.2 |  |
Snake River |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |
Gain on securities transaction recognized | $ 12.5 |  | $ 12.5 |  | $ 12.5 |
NL |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |
Net proceeds |  |  |  | $ 0.6 |  |

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