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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Pension liability | $ 31,152 | $ 36,791
Accrued warranty expense | 1,338 | 2,365
Accrued vacation pay | 7,442 | 7,077
Accrued liabilities for self-insurance (including postretirement health care benefits) | 2,602 | 2,991
Accrued liabilities for executive and employee incentive compensation | 13,312 | 12,121
Environmental and products liabilities | 20,261 | 20,100
Lease liabilities | 2,155 | 1,856
Investments in joint ventures and affiliated companies | 1,148 | 4,702
Long-term contracts | 15,974 | 10,790
Accrued payroll taxes | 4,828 | 0
U.S. federal tax credits and loss carryforward | 7,224 | 4,177
U.S. state tax credits and loss carryforward | 6,819 | 7,297
Foreign tax credit and loss carryforward | 9,919 | 5,848
Other | 4,961 | 4,621
Total deferred tax assets | 129,135 | 120,736
Valuation allowance for deferred tax assets | (12,892) | (13,578)
Deferred tax assets | 116,243 | 107,158
Deferred tax liabilities: |  |
Property, plant and equipment | 39,315 | 23,889
Right-of-use lease assets | 10,509 | 10,446
Intangibles | 17,004 | 14,134
Total deferred tax liabilities | 66,828 | 48,469
Net deferred tax assets | $ 49,415 | $ 58,689

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