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Assets Held for Sale - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |
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Sep. 30, 2012
Rigs
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Dec. 31, 2012
Rigs
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Dec. 31, 2011
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| Long Lived Assets Held-for-sale [Line Items] | |||
| Assets held for sale | $ 11,550,000 | $ 5,315,000 | |
| Number of Land Rigs classification assets held for sale | 2 | 5 | |
| Number of Land Rigs impacting assets held for sale in future | 3 | ||
| Received in down payment and deposits | 1,600,000 | ||
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Kazakhstan [Member]
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| Long Lived Assets Held-for-sale [Line Items] | |||
| Assets held for sale | 6,400,000 | ||
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Rig [Member]
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| Long Lived Assets Held-for-sale [Line Items] | |||
| Assets held for sale | $ 5,300,000 |
| X | ||||||||||
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- Definition
Number of land rigs and related equipment sold. No definition available.
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- Definition
Number of land rigs impacting assets held for sale. No definition available.
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- Definition
Payments Received On Assets Held For Sale No definition available.
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- Definition
Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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