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Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Accrued employee benefit plan costs | $ 7,422 | $ 7,607
Stock based compensation | 972 | 786
Net operating loss and tax credit carryforwards | 99,281 | 102,190
Restructuring fees not currently deductible for tax purposes | 2,264 | 3,113
Disallowed business interest expense carryforward | 5,105 | 2,936
Other | 3,380 | 5,890
Gross deferred tax assets | 118,424 | 122,522
Less valuation allowance | (103,496) | (106,447)
Net deferred tax assets | 14,928 | 16,075
Depreciation and amortization | (11,246) | (11,149)
Outside basis difference deferred tax liability | (2,892) | (2,891)
Other | (2,981) | (3,553)
Gross deferred tax liabilities | (17,119) | (17,593)
Net deferred tax assets (liabilities) | $ (2,191) | $ (1,518)

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