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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
	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

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.

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