Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Reconciliation of income taxes		21.00%	35.00%	35.00%
Income taxes, estimated net benefit	$ 25,700,000
Unrecognized tax benefits that would impact effective tax rate		$ 64,300,000
Unrecognized tax expense (benefits), interest and penalty expense (benefit) recognized		2,200,000	$ 2,000,000	$ 1,100,000
Unrecognized tax benefits, accrued interest and penalties		14,400,000		$ 11,800,000
Deferred tax assets, net operating losses and other tax carryforwards	25,600,000	21,200,000	25,600,000
Deferred tax assets, net operating losses and other tax carryforwards		7,100,000
Undistributed earnings of foreign subsidiaries		128,100,000
Reduction in deferred tax liabilities	$ 157,400,000	150,700,000	$ 157,400,000
Repatriation tax liability		28,500,000
Increase In Provision For Tax		8,200,000
Adjustments to deferred tax liabilty		5,500,000
Deferred tax liabilities of Foreign Subsidiaries		5,000,000
Federal Income Tax Rate [Member]
Income Taxes [Line Items]
Reduction in deferred tax liabilities		62,400,000
Foreign and State Tax [Member]
Income Taxes [Line Items]
Income tax liability for foreign and state taxes		9,300,000
Minimum [Member]
Income Taxes [Line Items]
Reasonably possible decrease in unrecognized tax benefits		$ 1,400,000
Deferred tax assets, remaining net operating losses and other tax carryforwards expiration period		2023
Maximum [Member]
Income Taxes [Line Items]
Reasonably possible decrease in unrecognized tax benefits		$ 3,500,000