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v3.19.1

Business Combinations, Dispositions and Related Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Nov. 30, 2015 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Impairment of long lived assets held for use |  |  |  |  |  |  | $ 170.6 |  |
Contract termination fee received | $ 4.0 |  |  |  |  |  |  |  |
Waste Management |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain from disposal of discontinued operations |  |  |  |  |  | $ 58.4 |  |  |
Impairment of long lived assets held for use |  |  |  | $ 170.6 |  |  |  |  |
Gain from disposal of discontinued operations, net of tax |  |  |  |  |  | $ 34.7 |  |  |
Waste Management | Discontinued Operations |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain from disposal of discontinued operations |  |  | $ 58.0 |  |  |  |  |  |
Gain from disposal of discontinued operations, net of tax |  |  | $ 34.7 |  |  |  |  |  |
Gain on disposal of discontinued operations, per diluted share, net of tax |  |  | $ 0.10 |  |  |  |  |  |
Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 2,000,000
Repurchased shares |  |  |  |  |  | 0 | 0 | 0 |
Shares available for purchase |  |  |  |  |  | 1,950,000 |  |  |
CompX | Class A |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Repurchased shares |  |  |  |  |  | 0 | 0 | 0 |
Shares available for purchase |  |  |  |  |  | 678,000 |  |  |
WCS |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Impairment of long lived assets held for use |  |  |  |  | $ 170.6 |  |  |  |
Property and equipment, salvage value | $ 5.7 |  |  | $ 5.7 | 5.7 |  |  |  |
Expenses related to sale of business including legal fees |  |  |  |  |  |  | $ 8.7 | $ 5.8 |
WCS | Net Property and Equipment |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Impairment of long lived assets held for use |  |  |  |  | 127.5 |  |  |  |
WCS | Disposal Site Operating Permits, Net |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Impairment of long lived assets held for use |  |  |  |  | 42.0 |  |  |  |
WCS | Other Assets |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Impairment of long lived assets held for use |  |  |  |  | $ 1.1 |  |  |  |
WCS | Divestiture Terms Pending |  |  |  |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of subsidiary |  | $ 270.0 |  |  |  |  |  |  |

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