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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Contingency [Line Items]
U.S. federal statutory rate		21.00%	35.00%	21.00%	21.00%	28.10%
Tax Act, incomplete accounting, provisional adjustments	$ (32,600,000)
Earnings per share increase	$ 0.45
Tax Act, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense				$ 0
Amount of valuation allowance increased				3,500,000	$ 1,100,000
Net deferred tax liabilities				166,100,000	185,600,000
Deferred tax assets				181,900,000	141,900,000
Deferred tax liability not recognized, Amount of unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries		$ 0				$ 0
Unrecognized tax benefits		$ 24,900,000		$ 23,500,000	$ 21,700,000	$ 24,900,000	$ 25,200,000
U.S. Federal and State Jurisdictions [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2015
U.S. Federal and State Jurisdictions [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2020
State Tax Authority [Member] | Earliest Tax Year [Member] | State of New Jersey [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2013
State Tax Authority [Member] | Earliest Tax Year [Member] | City of New York [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2014
State Tax Authority [Member] | Latest Tax Year [Member] | State of New Jersey [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2017
State Tax Authority [Member] | Latest Tax Year [Member] | City of New York [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2016
Foreign Tax Authority [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2013
Foreign Tax Authority [Member] | Earliest Tax Year [Member] | Federal Ministry of Finance, Germany [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2013
Foreign Tax Authority [Member] | Earliest Tax Year [Member] | Switzerland Federal Tax Administration [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2015
Foreign Tax Authority [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2020
Foreign Tax Authority [Member] | Latest Tax Year [Member] | Federal Ministry of Finance, Germany [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2015
Foreign Tax Authority [Member] | Latest Tax Year [Member] | Switzerland Federal Tax Administration [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2016
Assurex [Member]
Income Tax Contingency [Line Items]
Net deferred tax liabilities				$ 67,600,000
Deferred tax assets				$ 60,700,000

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