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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Decrease in effective tax rate | 89.30% |  |
Effective tax rate | 12.50% | 101.80% | 35.80%
Increase (decrease) in effective tax rate due to tax reform | (1.30%) | 66.70% |
Decrease in effective tax rate due to change in U.S.federal corporate tax rate | 14.00% |  |
Decrease in effective tax rate of goodwill impairment | 6.90% |  |
Decrease in effective tax rate of valuation allownaces | 3.70% |  |
Increase in effective tax rate due to remeasurement of deferred tax assets and liabilities for state tax | 2.30% |  |
U.S. federal corporate tax rate | 21.00% | 35.00% | 35.00%
Tax expense as adjustment to provisional amounts |  | $ 4,600,000 |
Additional taxes for one-time transition tax |  | 0 |
Income inclusion amount in final transition tax computation |  | 13,700,000 |
Additional tax expense to adjust provisional estimate on remeasurement of U.S. deferred tax assets and liabilities |  | $ 1,700,000 |
Valuation allowances against net deferred tax assets | $ 13,232,000 |  |
Gross federal net operating losses | 1,300,000,000 |  |
Gross canadian net operating losses | 24,700,000 |  |
Post-apportionment state net operating losses | 735,000,000 |  |
Unrecognized tax benefits | $ 0 |  |
Tax reform |  |  |
Income Taxes [Line Items] |  |  |
U.S. federal corporate tax rate | 21.00% | 35.00% |
Provisional income tax benefit |  | $ 219,000,000 |
Operations Outside of North America |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances against net deferred tax assets | $ 200,000 |  |
State Jurisdictions |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances against net deferred tax assets | $ 4,900,000 |  |
Net operating loss carryforwards expiration, beginning year | 2023 |  |
Net operating loss carryforwards expiration, ending year | 2038 |  |
Canada |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances against net deferred tax assets | $ 8,100,000 |  |
Net operating loss carryforwards expiration, beginning year | 2036 |  |
Net operating loss carryforwards expiration, ending year | 2038 |  |
Tax periods open for examination | Tax years ended December 31, 2012 through December 31, 2017 |  |
Canada | Earliest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Tax period open for examination | 2012 |  |
Canada | Latest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Tax period open for examination | 2017 |  |
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, 2013 through December 31, 2017 |  |
U.S. | Earliest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Tax period open for examination | 2013 |  |
U.S. | Latest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Tax period open for examination | 2017 |  |

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