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Income Taxes - Schedule of Current and Non-Current Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Reserves, Non-current | $ 11,931 | $ 7,987
Reserves, Current |  | 5,032
Compensation, Non-current | 8,250 | 5,075
Compensation, Current |  | 3,087
Post-retirement benefits, Non-current | 19,476 | 21,338
Post-retirement benefits, Current |  | 1,531
Property, Non-current | (84,009) | (89,432)
Intangible Assets, Current | 0 | 0
Intangible Assets, Non-current | (17,748) | (21,285)
Pension, Current |  | 532
Pension, Non-current | (26,885) | (30,412)
Inventories, Current |  | 2,758
Inventories, Non-current | 3,445 |
Other |  | (783)
Other, Non-current | 605 | 1,171
Research & development expenses | 8,925 |
Tax carryforwards, Non-current | 8,413 | 12,660
Tax carryforwards, Current |  | 8,560
Subtotal, Non-current | (67,597) | (92,898)
Subtotal, Current |  | 20,717
Valuation allowance, Non-current | (3,773) | (2,288)
Valuation allowance, Current |  | (934)
Total, Non-current | $ (71,370) | (95,186)
Total, Current |  | $ 19,783

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