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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