Income Taxes - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 28, 2020	Jan. 15, 2019	Dec. 31, 2017
Income Tax Examination [Line Items]
Accrued income taxes		$ 23,700,000	$ 22,400,000
Income taxes receivable		7,400,000	12,800,000
Income tax expense (benefit)		14,000,000.0	(4,000,000.0)	$ 13,100,000
Income (loss) before income taxes		6,100,000	(64,300,000)	(10,900,000)
Deferred tax benefit, corporate reorganization				(3,600,000)
Discrete tax expense related to Section 965 regulations						$ 1,100,000
Deferred tax assets, net		4,600,000	5,200,000
Liability for unrecognized tax benefits		19,700,000	18,200,000	17,900,000			$ 28,700,000
Unrecognized tax benefits that if recognized could impact the effective tax rate		19,700,000	18,200,000	17,900,000
Interest and penalties		1,100,000	1,000,000.0	(1,600,000)
Income tax penalties and interest accrued		9,400,000	8,300,000
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		2,000,000.0
Effective Income Tax Rate Reconciliation, Tax Credit, Amount		$ 3,600,000	$ 2,400,000	0
Preferred Stock, Par or Stated Value Per Share					$ 0.01
Common stock, par value (usd per share)		$ 0.01	$ 0.01		0.01
Warrant exercise price (in dollars per share)					$ 15.00
Sale of Stock, Percentage of Ownership before Transaction	4.95%
Warrants and Rights Outstanding, Maturity Date					Jul. 28, 2023
Deferred Tax Assets, Net of Valuation Allowance		$ 55,800,000	$ 65,600,000
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount		(12,000,000.0)	(2,200,000)	$ (700,000)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		(10,000,000.0)
Discrete Tax Expense Related to GILTI in prior years		1,700,000
Accounts Payable and Other Liabilities [Member]
Income Tax Examination [Line Items]
Deferred income tax liabilities, net		$ 25,800,000	$ 18,000,000.0