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Income Taxes - Narrative (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016
Income Taxes [Line Items] |  |  |  |
Net operating loss carryovers | $ 1,500,000,000 |  |  |
Tax Cuts and Jobs Act of 2017, provisional income tax benefit | 700,000 |  |  |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax asset, provisional income tax expense (benefit) |  | $ 207,700,000 |  |
Tax Cuts and Jobs Act of 2017, provisional income tax benefit |  | 800,000 |  |
Income (loss) before income taxes, foreign | 0 | $ 0 | $ 1,400,000 |
Alternative minimum tax credit carryovers | $ 1,400,000 |  |  |
Minimum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards expiration year | 2027 |  |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards expiration year | 2036 |  |  |
5% Convertible Senior Notes due 2021 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred tax asset, increase (decrease) |  |  | $ 8,600,000 |
Debt instrument, interest rate | 5.00% |  |  | 5.00%
Convertible Debt | 5% Convertible Senior Notes due 2021 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Debt instrument, interest rate | 5.00% |  | 5.00% |

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