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Income Taxes - Principal Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred income tax liabilities: |  |  |
Tax in excess of book depreciation | $ 44,834 | $ 37,425 |
Intangible assets | 73,405 | 80,623 |
Operating lease liabilities | 17,527 |  |
Other deferred tax liabilities | 4,857 | 794 |
Total deferred income tax liabilities | 140,623 | 118,842 |
Deferred income tax assets: |  |  |
Interest expense limitation | 14,674 | 9,968 |
Goodwill | 304 | 1,441 |
Inventories | 3,466 | 2,745 |
Interest rate swap | 2,839 | 0 |
Pension/Personnel accruals | 495 | 1,317 |
Operating lease right-of-use assets | 19,313 |  |
Net operating loss carry forwards | 15,876 | 9,321 |
U.S. foreign tax credit carryforwards | 3,360 | 5,345 |
R&D credit carryforwards | 2,654 | 917 |
Non-U.S. credit carryforwards | 3,313 | 4,130 |
Accruals and reserves | 2,299 | 1,531 |
Other deferred tax assets | 5,264 | 4,749 |
Deferred income tax assets before valuation allowance | 73,857 | 41,464 |
Valuation allowance on deferred tax assets | (19,033) | (14,460) | $ (7,608)
Total deferred income tax assets | 54,824 | 27,004 |
Net deferred income tax liabilities | $ 85,799 | $ 91,838 |

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