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Income Taxes - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |
Increase in effective tax rate |  |  | 66.00% |  |
Effective tax rate |  |  | 101.80% | 35.80% | 33.40%
Increase in effective tax rate due to tax reform |  |  | 66.70% |  |
Increase for excess tax benefits from employee stock compensation deductions |  |  | 3.60% |  |
Decrease in effective tax rate for acquisitions |  |  | 3.30% |  |
U.S. federal corporate tax rate |  |  | 35.00% | 35.00% | 35.00%
Income tax expense benefit |  |  | $ (333,711,000) | $ (177,562,000) | $ (147,963,000)
Individual compensation deductable limit under Section 162 (m) |  |  | 1,000,000 |  |
Maximum compensation paid to covered employees |  |  | 1,000,000 |  |
Additional taxes recorded from remeasurement of deferred tax assets and liabilities |  |  | 11,000,000 |  |
Other deferred tax assets |  |  | 27,100,000 |  |
Other deferred tax liabilities |  |  | 10,900,000 |  |
Gross federal net operating losses |  |  | 1,100,000,000 |  |
Canadian net operating losses |  |  | 19,200,000 |  |
Post-apportionment state net operating losses |  |  | 678,000,000 |  |
Unrecognized tax benefits |  |  | 0 |  |
Accounting Standards Update No. 2016-09 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Excess tax benefits from share-based compensations awards vested or exercised |  |  | $ 12,000,000 |  |
Tax Years Beginning After December 31, 2017 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
GIL TI effective tax rate | 10.50% |  |  |  |
Tax Years Beginning After December 31, 2025 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
GIL TI effective tax rate | 13.125% |  |  |  |
Tax reform |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
U.S. federal corporate tax rate |  |  | 35.00% |  |
Income tax expense benefit |  |  | $ 219,000,000 |  |
Percentage of dividends received deduction due to tax reform |  |  | 100.00% |  |
Canada |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax periods open for examination |  |  | Tax years ended December 31, 2013 through December 31, 2016 |  |
Canada | Prior Years |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | $ 11,000,000 |  |
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 |  |  | 2016 |  |
Federal, State and Canadian | Expire in 2023 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | $ 137,000 |  |
Federal, State and Canadian | Expire in 2025 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 2,800,000 |  |
Federal, State and Canadian | Expire in 2024 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 2,400,000 |  |
Federal, State and Canadian | Expire in 2026 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 17,400,000 |  |
Federal, State and Canadian | Expire in 2027 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 102,000 |  |
Federal, State and Canadian | Expire in 2029 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 33,200,000 |  |
Federal, State and Canadian | Expire in 2030 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 28,600,000 |  |
Federal, State and Canadian | Expire in 2031 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 101,900,000 |  |
Federal, State and Canadian | Expire in 2032 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 9,700,000 |  |
Federal, State and Canadian | Expire in 2034 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 30,000 |  |
Federal, State and Canadian | Expire in 2035 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 302,700,000 |  |
Federal, State and Canadian | Expire in 2036 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 644,600,000 |  |
Federal, State and Canadian | Expire in 2037 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | 647,100,000 |  |
State and Local Jurisdiction | Prior Years |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating losses carried forward |  |  | $ 1,000,000 |  |
U.S. |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax periods open for examination |  |  | Tax years ended December 31, 2013 through December 31, 2016 |  |
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 |  |  | 2016 |  |
Scenario Forecast | Tax reform |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
U.S. federal corporate tax rate |  | 21.00% |  |  |

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