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Income Taxes - Schedule Showing Tax Effects of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Deferred Tax Liabilities: |  |
Depreciation | $ (51,244) | $ (75,973)
Unrealized foreign exchange loss | (734) | (631)
Other | (2,066) | (2,756)
Deferred Tax Liabilities, Gross | (54,044) | (79,360)
Deferred Tax Assets: |  |
Pensions | 7,884 | 12,077
Deferred revenue | 232 | 940
Other accruals and reserves | 13,660 | 20,590
Inventories | 1,182 | 1,815
Legal and environmental accruals | 7,243 | 11,503
Deferred compensation | 15,402 | 24,485
Bad debt and rebate reserves | 2,865 | 4,195
Non-U.S. subsidiaries net operating loss carryforwards | 2,657 | 1,201
Tax credit carryforwards | 1,851 | 1,599
Deferred Tax Assets, Gross | 52,976 | 78,405
Valuation Allowance | (2,255) | (1,815)
Net Deferred Tax Liabilities | (3,323) | (2,770)
Reconciliation to Consolidated Balance Sheet: |  |
Non-current deferred tax assets (in other non-current assets) | 7,639 | 9,727
Non-current deferred tax liabilities | $ (10,962) | $ (12,497)

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