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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (deficit) |  | $ 220.3 |  |  |  | $ (17.9) |  |  |  | $ 220.3 | $ (17.9) |
Land sales revenue |  | $ 388.7 | $ 455.2 | $ 510.2 | $ 466.0 | $ 495.9 | $ 496.5 | $ 481.7 | $ 405.3 | 1,820.1 | 1,879.4 | $ 1,519.4
Real Estate Management And Development |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Land sales revenue |  |  |  |  |  |  |  |  |  | 40.0 | 38.4 | 46.2
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 | Difference between Revenue Guidance in Effect before and after Topic 606 | Real Estate Management And Development |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (deficit) | 6.1 |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Real Estate Management And Development | Non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (deficit) | $ 2.7 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 10.8 | 7.7
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 |  |  |  |  |  |  |  |  |  |  | $ 6.8 | $ 3.8
Land [Member] | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Real Estate Management And Development |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Land sales revenue |  |  |  |  |  |  |  |  |  | $ 0.1 |  |

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