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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax [Line Items] |  |  |  |
Percentage of benefit due to valuation allowance release |  | 116.30% |  |
Valuation allowance release, amount |  | $ 109,800,000 |  |
Decrease in effective tax rate due to valuation allowance, percentage |  | 0.60% | 37.00% | 44.80%
Decrease in effective tax rate due to valuation allowance, amount |  |  | $ 51,600,000 | $ 77,000,000
Decrease in effective tax rate due to settlement of a federal income tax audit, percentage |  |  | 2.40% |
Increase in effective tax rate |  |  |  | 6.80%
Unrecognized tax benefits that would impact effective tax rate | $ 6,400,000 | $ 6,400,000 | $ 8,000,000 |
Short-term reserves | 600,000 | 600,000 |  |
Long-term reserves | 7,100,000 | 7,100,000 |  |
Interest and penalties |  | $ 1,986,000 | 2,820,000 | $ 3,107,000
Significant change in unrecognized tax benefits, nature of event description |  | Due to the potential for resolution of federal and state examinations, and the expiration of various statutes of limitations |  |
Gross unrecognized tax benefits change range, minimum | 0 | $ 0 |  |
Gross unrecognized tax benefits change range, maximum | 1,000,000 | 1,000,000 |  |
Illinois edge credits available to offset future state income tax |  | 9,800,000 |  |
Valuation allowance released | 109,800,000 |  |  |
Net deferred income tax assets | 47,500,000 | 47,500,000 |  |
Domestic Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards | 134,800,000 | 134,800,000 |  |
Operating loss carrybacks | 97,500,000 | 97,500,000 |  |
Tax refund due to carryback of losses |  | 14,000,000 |  |
Foreign Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Foreign tax credits | 33,000,000 | 33,000,000 |  |
State and Local Jurisdiction [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards | 319,700,000 | 319,700,000 |  |
Separate State [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards | $ 166,000,000 | 166,000,000 |  |
Maximum [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Unrecognized tax benefits, income tax penalties and interest benefit/expense recognized |  | $ 700,000 | $ 100,000 | $ 700,000
Maximum [Member] | Illinois [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Edge credits expiration year |  | 2019 |  |
Maximum [Member] | Domestic Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards, expiration year |  | 2035 |  |
Maximum [Member] | Foreign Country [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Foreign tax credits, expiration year |  | 2023 |  |
Maximum [Member] | State and Local Jurisdiction [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards, expiration year |  | 2035 |  |
Minimum [Member] | Illinois [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Edge credits expiration year |  | 2016 |  |
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 and Local Jurisdiction [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carry forwards, expiration year |  | 2016 |  |

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