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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ (3.1) | $ 1.0 | $ (4.8) | $ 2.6 |
Approximate rate on pre-tax income | 27.20% | 27.80% |  |  |
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] | Earliest Tax Year [Member] | State of New York [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2014 |  |
State Tax Authority [Member] | Earliest Tax Year [Member] | State of Massachusetts [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] | State of New York [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2016 |  |
State Tax Authority [Member] | Latest Tax Year [Member] | State of Massachusetts [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax year being audited in income tax examination |  |  | 2016 |  |
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] | 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 |  |
Scenario Forecast [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
U.S. federal statutory rate |  |  |  |  | 21.00%

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