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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax [Line Items] |  |  |  |
Pretax income (loss) from continuing operations |  | $ 93,022,000 | $ 74,352,000 | $ 36,250,000
Recognition of an excess tax benefit and deficiency |  | $ 1,200,000 | $ 1,000,000.0 |
Effective tax rate impact associated with stock-based compensation |  | 1.30% | 1.40% | (3.20%)
Decrease in effective tax rate due to settlement of a state income tax audit, percentage |  | (0.50%) | 0.10% | (4.60%)
Effective income tax rate, deductible amount | $ 29,700,000 |  |  |
Income tax rate non deductible legal settlement |  |  | $ 1,100,000 |
Effective income tax rate legal agreements |  |  | 1.40% |
U.S. corporate tax rate |  | 21.00% | 21.00% | 35.00%
Effective tax rate increased |  |  |  | 145.30%
Increase in tax expense (benefit) due to revaluation |  |  |  | $ 52,700,000
Unrecognized tax benefits that would impact effective tax rate | 9,300,000 | $ 9,300,000 | $ 8,600,000 |
Short-term reserves | 1,000,000.0 | 1,000,000.0 |  |
Long-term reserves | 8,900,000 | 8,900,000 |  |
Interest and penalties | 1,900,000 | $ 1,900,000 | 1,900,000 |
Significant change in unrecognized tax benefits, nature of event description |  | Due to the expiration of various statutes of limitations |  |
Gross unrecognized tax benefits change range, minimum | 0 | $ 0 |  |
Gross unrecognized tax benefits change range, maximum | 1,500,000 | 1,500,000 |  |
Deferred tax asset, gross | 334,900,000 | 334,900,000 | 382,800,000 |
Deferred tax liability, gross | 56,800,000 | 56,800,000 | 4,900,000 |
Illinois edge gross credits not be used to offset state income tax prior to expiration |  | 1,800,000 |  |
Net deferred income tax assets | 45,000,000.0 | 45,000,000.0 | 48,000,000.0 |
Reduction in valuation allowance |  | 1,400,000 | 800,000 |
Domestic Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards | 108,500,000 | 108,500,000 |  |
Foreign Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Foreign tax credits | 33,000,000.0 | 33,000,000.0 |  |
State [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards | 380,800,000 | 380,800,000 |  |
Combined State [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards | 19,000,000.0 | 19,000,000.0 |  |
Separate State [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards | $ 178,700,000 | 178,700,000 |  |
Maximum [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Unrecognized tax benefit, income tax penalties and interest (benefit)/expense recognized |  | $ (100,000) | $ (100,000) | 200,000
Maximum [Member] | Domestic Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards, expiration year |  | 2037 |  |
Maximum [Member] | Foreign Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Foreign tax credits, expiration year |  | 2023 |  |
Maximum [Member] | State [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards, expiration year |  | 2037 |  |
Minimum [Member] | Domestic Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards, expiration year |  | 2035 |  |
Minimum [Member] | Foreign Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Foreign tax credits, expiration year |  | 2022 |  |
Minimum [Member] | State [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards, expiration year |  | 2020 |  |
ASU 2016-09 [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Recognition of an excess tax benefit and deficiency |  |  |  | $ (1,100,000)
Increase in annual effective tax rate due to recognition of an excess tax benefit and deficiency |  |  |  | 3.20%
Florida [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net benefit associated with results of state income tax audit |  | $ 500,000 |  |
Decrease in effective tax rate due to settlement of a state income tax audit, percentage |  | 0.50% |  |
Illinois [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Decrease in effective tax rate due to settlement of a state income tax audit, percentage |  |  |  | (4.60%)
Increase in tax expense (benefit) due to revaluation |  |  |  | $ (1,700,000)
Illinois [Member] | Maximum [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Edge credits expiration year |  | 2019 |  |

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