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Income Taxes - Principal Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax liabilities: |  |
Tax in excess of book depreciation | $ 27,459 | $ 28,329
Intangible assets | 23,695 | 26,474
Operating leases | 11,149 | 12,697
Taxes on unremitted foreign earnings | 6,601 | 0
Other deferred tax liabilities | 533 | 2,178
Total deferred income tax liabilities | 69,437 | 69,678
Deferred income tax assets: |  |
Interest expense limitation | 3,811 | 14,073
Goodwill | 25,653 | 386
Inventories | 3,224 | 2,447
Interest rate swap | 3,611 | 2,838
Pension/Personnel accruals | 2,909 | 1,669
Operating leases | 13,209 | 14,438
Net operating loss carryforwards | 18,659 | 15,486
R&D credit carryforwards | 0 | 2,463
Non-U.S. credit carryforwards | 3,574 | 3,419
Accruals and reserves | 2,399 | 2,335
Other deferred tax assets | 2,891 | 1,157
Deferred income tax assets before valuation allowance | 79,940 | 60,711
Valuation allowance on deferred tax assets | (21,681) | (15,494)
Total deferred income tax assets | 58,259 | 45,217
Net deferred income tax liabilities | $ 11,178 | $ 24,461

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