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Asset Retirement Obligation - Schedule of Consolidated Balance Sheet where Asset Retirement Obligations Recorded (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Asset Retirement Obligations [Line Items] |  |  |  |
Asset retirement obligations | $ 5,142 | $ 8,882 | $ 9,081 | $ 9,679
Other Current Liabilities [Member] |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |
Asset retirement obligations | 1,200 | 3,600 |  |
Other Long Term Liabilities [Member] |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |
Asset retirement obligations | $ 3,900 | $ 5,300 |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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