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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Loss before income taxes for the U.S. jurisdictions | $ 917,000,000 | $ 500,000,000 | $ 343,000,000
Loss before income taxes for non-U.S. jurisdictions | $ 14,200,000 | $ 30,500,000 | $ 24,300,000
Decrease in effective tax rate due to goodwill impairment charges | 6.00% |  |
Effective income tax rate | 13.70% | 19.70% | 12.50%
Decrease in effective tax rate of goodwill impairment | 8.20% | 0.70% | 6.90%
Valuation allowances against net deferred tax assets | $ 19,133,000 | $ 17,231,000 |
Gross federal net operating losses | 1,400,000,000 |  |
Gross Canadian net operating losses | 49,400,000 |  |
Post-apportionment state net operating losses | 931,000,000 |  |
Unrecognized tax benefits | 0 |  |
Canada |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances against net deferred tax assets | $ 1,900,000 |  |
Net operating loss carryforwards expiration, beginning year | 2036 |  |
Net operating loss carryforwards expiration, ending year | 2040 |  |
Tax periods open for examination | Tax years ended December 31, 2013 through December 31, 2019 |  |
Canada | Earliest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Tax period open for examination | 2013 |  |
Canada | Latest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Tax period open for examination | 2019 |  |
U.S. |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards expiration, beginning year | 2034 |  |
Net operating loss carryforwards expiration, ending year | 2037 |  |
Tax periods open for examination | Tax years ended December 31, 2014 through December 31, 2019 |  |
U.S. | Earliest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Tax period open for examination | 2014 |  |
U.S. | Latest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Tax period open for examination | 2019 |  |
State Jurisdictions |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards expiration, beginning year | 2023 |  |
Net operating loss carryforwards expiration, ending year | 2040 |  |

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