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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended				12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017		Jun. 30, 2019	Jun. 30, 2018
Income Tax Contingency [Line Items]
U.S. federal statutory rate				21.00%	21.00%	35.00%			28.00%
Tax Act, incomplete accounting, provisional adjustments		$ (32,600,000)
Earnings per share increase		$ 0.45
Tax Act, limitation on deduction of executive compensation				$ 1,000,000
Tax Act, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense				0
Income tax expense	$ 1,000,000	$ (25,300,000)	[1]	$ 2,600,000		$ (20,800,000)	[1]
Approximate rate on pre-tax income	27.80%	451.80%
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] | Latest Tax Year [Member] | State of New Jersey [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2017
Foreign Tax Authority | 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 | Latest Tax Year [Member] | Federal Ministry of Finance, Germany [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination				2015
Scenario, Plan [Member]
Income Tax Contingency [Line Items]
U.S. federal statutory rate								21.00%
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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