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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings (deficit) |  | $ 72.6 |  | $ 72.6 |  | $ (17.9)
Land sales revenue |  | 510.2 | $ 481.8 | 976.2 | $ 887.1 |
Real Estate Management And Development |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Land sales revenue |  | 6.0 | 10.3 | 13.2 | 15.9 |
Accounting Standards Update 2014-09 | Real Estate Management And Development |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Receivable | $ 6.1 |  |  |  |  |
Contract asset | 8.8 |  |  |  |  |
Offsetting liability for deferred revenue | 8.8 |  |  |  |  |
Accounting Standards Update 2014-09 | Real Estate Management And Development | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings (deficit) | 6.1 |  |  |  |  |
Accounting Standards Update 2014-09 | Real Estate Management And Development | Difference between Revenue Guidance in Effect before and after Topic 606 | Non-controlling interest |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings (deficit) | $ 2.7 |  |  |  |  |
Accounting Standards Update 2014-09 | Land [Member] | Real Estate Management And Development | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Land sales revenue |  | $ 0.1 |  | $ (0.2) |  |
ASU 2017-07 | Cost of Sales |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification adjustment to other components of net periodic pension and OPEB cost |  |  | 2.6 |  | 5.2 |
ASU 2017-07 | Selling, General and Administrative Expenses |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification adjustment to other components of net periodic pension and OPEB cost |  |  | $ 1.7 |  | $ 3.2 |

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