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Restructuring and Impairment Charges - Summary of Impairment and Restructuring Charges (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment charges | $ 4,000 | $ 1,891
Wheeling Plant [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Impairment of tangible assets | 328 | 361
Restructuring charges and contract costs | 1,749 | 3,275
Restructuring and impairment charges | 2,077 | 3,636
Reserve beginning balance |  | 2,290
Charges |  | 3,636
Paid in 2016 |  | (4,051)
Reserve ending balance | 1,875 | 1,875
Wheeling Plant [Member] | Severance and Other Employee Costs [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Reserve beginning balance |  | 445
Charges |  | 869
Paid in 2016 |  | (1,298)
Reserve ending balance | 16 | 16
Wheeling Plant [Member] | Site Closure and Other Associated Cost [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Reserve beginning balance |  | 1,845
Charges |  | 2,767
Paid in 2016 |  | (2,753)
Reserve ending balance | $ 1,859 | $ 1,859

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