The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 27, 28, 29, 30

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Assets Held-for-Sale and Discontinued Operations (Details) (USD $)	3 Months Ended	6 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Oil and Gas	Dec. 31, 2012 Oil and Gas	Jul. 31, 2013 Oil and Gas United States	Apr. 02, 2013 Rig Services	Dec. 31, 2012 Rig Services
Assets held-for-sale
Assets held for sale			$ 351,263,000	$ 383,857,000	$ 351,263,000	$ 377,625,000			$ 6,232,000
Adjustment to carrying value of assets	46,264,000	46,264,000			34,400,000
Sale price							$ 90,000,000	$ 9,300,000