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Quarterly Financial Data - Schedule of Quarterly Financial Information (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 30,566 | $ 48,909 | $ 38,659 | $ 25,422 | $ 40,370 | $ 33,187 | $ 65,735 | $ 44,444 | $ 143,556 | $ 183,736 | $ 223,018
Income from continuing operations | 37,473 | 10,250 | 7,486 | (68) | 11,622 | 6,710 | 26,130 | 14,324 | 55,141 | 58,786 | 83,984
Business interruption insurance recoveries [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit | 10,203 | 4,227 | 3,400 | 10,810 | 7,300 |  |  |  |  |  |
Income from continuing operations | 10,203 | 4,227 | 3,400 | 10,810 | 7,300 |  |  |  |  |  |
Interest expense [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | 7,324 | 5,395 | 536 | 731 | 437 | 1,489 | 1,179 | 1,132 |  |  |
Property Insurance Recoveries [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | 66,000 | 255 |  |  |  |  |  |  |  |  |
Precious Metal Recovery [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit |  | 4,493 |  |  | 301 | 250 |  | 29 |  |  |
Income from continuing operations |  | $ 4,493 |  |  | $ 301 | $ 250 |  | $ 29 |  |  |

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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