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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Taxes Disclosure [Line Items] |  |  |  |
U.S. federal statutory income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Non-cash income tax benefit |  |  |  | $ 1.4
Provision for income taxes includes non-cash deferred income tax expense |  |  | $ 3.8 | $ 7.1
Business interest income, adjusted taxable income |  |  |  | 30.00%
Increase (decrease) in unrecognized tax benefits | $ (3.7) |  | $ (3.7) |
ASC 740 | Discontinued Operations |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Provision for income taxes includes non-cash deferred income tax expense |  |  |  | $ 5.1
ASC 740 | Continuing Operations |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Provision for income taxes includes non-cash deferred income tax expense |  |  |  | $ 2.0

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