Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Adjustment to net deferred tax assets and liabilities			$ 1,500,000
Net operating loss and other carryforwards expiring between 2020 and 2029	$ 113,500,000
Valuation allowances	174,400,000	$ 187,900,000
Deferred tax liabilities related to foreign earnings	4,500,000	6,700,000	6,500,000
Cash payments for income taxes	68,700,000	73,100,000	37,200,000
Cash refunds for income taxes	7,200,000	12,100,000	52,500,000
Unrecognized tax benefits	20,700,000	23,100,000	25,000,000.0	$ 30,900,000
Unrecognized tax benefits that would impact effective tax rate	13,300,000
Amount of unrecognized tax benefit that will decrease within 12 months	10,800,000
Penalty amounts recognized	0	0	$ 0
Accrued interest related to income tax uncertainties	3,700,000	3,600,000
Accrued penalties related to income tax uncertainties	0	0
Domestic
Domestic and foreign net operating loss and other tax credit carryforwards	126,800,000	141,200,000
Foreign
Domestic and foreign net operating loss and other tax credit carryforwards	$ 68,800,000	$ 64,400,000