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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]
Global Intangible Low-Taxed Income Expense	$ 23,300,000
U.S. federal tax rate	21.00%	21.00%	21.00%
Dividend deduction percentage	100.00%
Deferred tax assets realized	$ 127,300,000
Valuation allowance	257,171,000	$ 203,765,000
Operating loss carryforwards	270,699,000	220,156,000
Deferred tax asset	274,000,000.0
Valuation allowance for net operating loss carryforwards	225,800,000
Reduction in accrual for interest and penalties	3,400,000	11,000,000.0	$ 1,100,000
Unrecognized tax benefits, including interest	116,300,000
Tax benefits credited to Shareholders' equity	100,000	100,000
Tax Credit Carryforward, Valuation Allowance	10,000,000.0
Deferred Tax Liabilities, Deemed Repatriation	47,144,000	46,066,000
Other liabilities [Member]
Income Taxes [Line Items]
Unrecognized tax benefits that would impact effective tax rate	98,200,000	73,600,000	47,300,000
Other Current Liabilities [Member]
Income Taxes [Line Items]
Unrecognized tax benefits that would impact effective tax rate	700,000	1,200,000	3,600,000
2018 to 2037 [Member]
Income Taxes [Line Items]
Operating loss carryforwards	246,100,000	207,900,000
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	42,100,000
Tax credit carryforwards	27,900,000	18,500,000
Indefinite [Member]
Income Taxes [Line Items]
Operating loss carryforwards	204,000,000.0
Other Liabilities [Member]
Income Taxes [Line Items]
Accrued interest and penalties	17,300,000	14,000,000.0	3,000,000.0
Other Current Liabilities [Member]
Income Taxes [Line Items]
Accrued interest and penalties	100,000	$ 0	$ 0
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Valuation allowance	12,600,000
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Deferred Tax Liabilities, Deemed Repatriation	47,100,000
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Deferred Tax Liabilities, Deemed Repatriation	$ 0

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