Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Jun. 30, 2018	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018
Income Tax Contingency [Line Items]
U.S. federal statutory rate					35.00%
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 (benefit)	$ 5,200,000		$ 3,800,000			$ (17,700,000)	$ 15,200,000
Income tax expense benefit excluding change in enacted tax rate						$ 14,900,000
Approximate rate on pre-tax income	31.50%		47.50%				63.10%
Effective income tax rate continuing operations excluding change in enacted tax rate						14.00%
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Tax Act, incomplete accounting, provisional adjustments	$ 0
Foreign Tax Authority [Member] | Earliest Tax Year [Member] | Canada Revenue Agency [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination						2014
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] | Latest Tax Year [Member] | Canada Revenue Agency [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination						2015
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
U.S. Tax Authority [Member] | Tax Year 2014 [Member] | IRS [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination						2014
U.S. Tax Authority [Member] | Tax Year 2015 [Member] | IRS [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination						2015
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						2007
State Tax Authority [Member] | Earliest Tax Year [Member] | State of Wisconsin [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						2013
State Tax Authority [Member] | Latest Tax Year [Member] | State of Wisconsin [Member]
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination						2016
Scenario, Plan [Member]
Income Tax Contingency [Line Items]
U.S. federal statutory rate				21.00%				28.00%