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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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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%