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Other Income, Net - Additional Information (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) Parcel | Jun. 30, 2018 USD ($)
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |
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 |
NL |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |
Net proceeds |  | 0.6 |
Promissory Note | Tremont |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |
Principal payment of debt | $ 2.2 | $ 2.2 |

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- Definition The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Details
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