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Business Segments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 Customer | Dec. 31, 2012 Customer | Dec. 31, 2011 Customer
Segment Reporting Disclosure [Line Items] |  |  |
Number of reportable business segments | 3 |  |
Marketable land-based drilling rigs | 279 |  |
Long-lived assets | $ 3,635,541,000 | $ 3,615,383,000 |
Major Customer |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Revenues | 286,000,000 |  |
Number of customers accounted for 10% or more of consolidated revenues | 1 | 0 | 0
Major Customer | Revenues |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Percentage of sales revenues | 10.50% |  |
Canada | Contract Drilling |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Oil and gas services | 86,600,000 | 79,400,000 | 106,000,000
Long-lived assets | $ 69,100,000 | $ 72,600,000 |

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