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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax [Line Items] |  |  |
Pretax income (loss) from continuing operations | $ 74,352,000 | $ 36,250,000 | $ (31,366,000)
Recognition of an excess tax benefit and deficiency | $ 1,000,000 |  |
Effective tax rate impact associated with stock-based compensation | 1.40% | (3.20%) |
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% | 35.00% | 35.00%
Effective tax rate increased |  | 145.30% |
Increase in tax expense (benefit) due to revaluation |  | $ 52,700,000 |
Decrease in effective tax rate due to settlement of a state income tax audit, percentage | 0.10% | (4.60%) |
Worthless stock deduction, tax benefit net |  |  | $ 3,700,000
Decreased effective tax rate on worthless stock |  |  | 11.90%
Effective rate tax adjustment related to federal tax, amount |  |  | $ 2,100,000
Decrease in effective tax rate due to settlement of a federal income tax audit, percentage |  |  | 6.70%
Unrecognized tax benefits that would impact effective tax rate | $ 8,600,000 | $ 8,300,000 |
Short-term reserves | 1,000,000 |  |
Long-term reserves | 8,000,000 |  |
Interest and penalties | $ 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 |  |
Gross unrecognized tax benefits change range, maximum | 1,600,000 |  |
Deferred tax asset, gross | 382,800,000 | 457,900,000 |
Deferred tax liability, gross | 4,900,000 | 5,300,000 |
Illinois edge gross credits available to offset future state income tax | 1,800,000 |  |
Net deferred income tax assets | 48,000,000 | 50,500,000 |
Domestic Country [Member] |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carry forwards | 193,600,000 |  |
Foreign Country [Member] |  |  |
Income Tax [Line Items] |  |  |
Foreign tax credits | 33,000,000 |  |
State [Member] |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carry forwards | 437,100,000 |  |
Combined State [Member] |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carry forwards | 38,800,000 |  |
Separate State [Member] |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carry forwards | 193,400,000 |  |
Maximum [Member] |  |  |
Income Tax [Line Items] |  |  |
Unrecognized tax benefits, income tax penalties and interest benefit/expense recognized | $ (100,000) | 200,000 | $ (100,000)
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 | 2034 |  |
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 | 2019 |  |
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% |
Illinois [Member] |  |  |
Income Tax [Line Items] |  |  |
Increase in tax expense (benefit) due to revaluation |  | $ 1,700,000 |
Decrease in effective tax rate due to settlement of a state income tax audit, percentage |  | (4.60%) |
Illinois [Member] | Maximum [Member] |  |  |
Income Tax [Line Items] |  |  |
Edge credits expiration year | 2019 |  |

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