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Asset Retirement Obligation - Schedule of Consolidated Balance Sheets where Asset Retirement Obligations are Recorded (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Asset retirement obligations	$ 982	$ 4,114	$ 4,594	$ 5,032
Other Current Liabilities [Member]
Asset retirement obligations	$ 982	2,855
Other Long-Term Liabilities [Member]
Asset retirement obligations		$ 1,259

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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

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