Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal statutory tax rate	21.00%	35.00%	35.00%
Tax on foreign earnings	$ 4,200,000	$ 103,500,000
Adjustment to net deferred tax assets and liabilities	1,500,000	6,800,000
Deferred tax assets, valuation allowance recorded	23,900,000
Deferred tax assets, valuation allowance provision	255,900,000	238,300,000
Net operating loss and other carryforwards expiring between 2018 and 2027	124,800,000
Deferred tax liabilities related to foreign earnings	6,500,000	4,700,000
Undistributed earnings of foreign subsidiaries	826,300,000
Cash payments for income taxes	37,200,000	46,100,000	$ 108,200,000
Cash refunds for income taxes	52,400,000	43,300,000	7,200,000
Excess tax benefit in share base compensation	1,700,000	500,000	2,600,000
Income tax benefit associated with dispositions of employee stock options			2,300,000
Unrecognized tax benefits	25,000,000	30,900,000	41,900,000	$ 51,000,000
Unrecognized tax benefits that would impact effective tax rate	21,400,000
Amount of unrecognized tax benefit that will decrease within 12 months	1,600,000
Total interest (benefit) expense related to remaining tax uncertainties	(1,100,000)	200,000	(500,000)
Penalty amounts recognized	0	0	0
Accrued interest related to income tax uncertainties	2,900,000	4,200,000
Accrued penalties related to income tax uncertainties	0	0
State and Local Jurisdiction
Deferred tax assets, valuation allowance provision			$ 9,500,000
Domestic
Domestic and foreign net operating loss carryforwards	166,400,000	141,100,000
Foreign
Domestic and foreign net operating loss carryforwards	$ 113,600,000	114,000,000
Capital Loss Carry Forward
Pre-tax capital loss		$ 51,600,000