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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
rig
country
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
segment
rig
country
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Dec. 31, 2012
Customer
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Dec. 31, 2011
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Apr. 22, 2013
ITS [Member]
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Dec. 31, 2013
ITS [Member]
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| Revenue, Major Customer [Line Items] | |||||||||||||
| Number of countries with operations | 24 | 24 | |||||||||||
| Number of countries with international rental tools operations | 10 | 10 | |||||||||||
| Number of operating segments | 5 | ||||||||||||
| Barge drilling rigs | 13 | 13 | |||||||||||
| Land rings | 23 | 23 | |||||||||||
| Percentage accounted for under the equity method | 50.00% | 50.00% | |||||||||||
| Reimbursement cost | $ 69,700,000 | $ 44,900,000 | $ 64,200,000 | ||||||||||
| Definite-lived intangible asset | 10,000,000 | ||||||||||||
| Indefinite-lived intangible asset | 200,000 | ||||||||||||
| Adjusted amount for definite lived intangible assets | 8,500,000 | ||||||||||||
| Adjusted amount for indefinite lived intangible assets | 0 | ||||||||||||
| Definite lived assets, weighted average useful life | 3 years 4 months 24 days | 3 years | |||||||||||
| Collection period | 90 days | ||||||||||||
| Capitalized interest costs of construction of rigs | 2,400,000 | 10,200,000 | 19,300,000 | ||||||||||
| Consumed and replenished period | 1 year | ||||||||||||
| Rate of recognized income tax position being realized | 50.00% | ||||||||||||
| Deposits in domestic bank | 104,300,000 | 12,200,000 | 104,300,000 | 12,200,000 | |||||||||
| Deposits in foreign banks | 50,100,000 | 34,500,000 | 50,100,000 | 34,500,000 | |||||||||
| Number of major customer | 2 | ||||||||||||
| Percentage of revenue from major customer | 15.60% | ||||||||||||
| Contract margin | $ 48,564,000 | $ 48,733,000 | $ 50,273,000 | $ 20,877,000 | $ 16,637,000 | $ 34,261,000 | $ 46,914,000 | $ 53,744,000 | $ 168,447,000 | $ 151,556,000 | $ 157,421,000 | ||
| Share-based awards vesting period | 3 years | ||||||||||||