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Summary of Significant Accounting Policies - Summary of Depreciable Lives for Different Categories of Property Plant and Equipment (Detail)
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12 Months Ended |
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Dec. 31, 2013
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Land drilling equipment [Member] | Minimum [Member]
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| Property, Plant and Equipment [Line Items] | |
| Barge drilling equipment, useful life | 3 years |
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Land drilling equipment [Member] | Maximum [Member]
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| Property, Plant and Equipment [Line Items] | |
| Barge drilling equipment, useful life | 20 years |
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Barge drilling equipment [Member] | Minimum [Member]
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| Property, Plant and Equipment [Line Items] | |
| Barge drilling equipment, useful life | 3 years |
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Barge drilling equipment [Member] | Maximum [Member]
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| Property, Plant and Equipment [Line Items] | |
| Barge drilling equipment, useful life | 20 years |
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Drill pipe, rental tools and other [Member] | Minimum [Member]
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| Property, Plant and Equipment [Line Items] | |
| Barge drilling equipment, useful life | 4 years |
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Drill pipe, rental tools and other [Member] | Maximum [Member]
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| Property, Plant and Equipment [Line Items] | |
| Barge drilling equipment, useful life | 10 years |
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Buildings and improvements [Member] | Minimum [Member]
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| Property, Plant and Equipment [Line Items] | |
| Barge drilling equipment, useful life | 5 years |
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Buildings and improvements [Member] | Maximum [Member]
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| Property, Plant and Equipment [Line Items] | |
| Barge drilling equipment, useful life | 30 years |