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Business Segments - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Rigs Segment Customer	Dec. 31, 2016 USD ($) Customer	Dec. 31, 2015 USD ($) Customer
Segment Reporting Disclosure [Line Items]
Number of reportable business segments | Segment	3
Long-lived assets	$ 4,254,730	$ 3,408,963
Major Customer
Segment Reporting Disclosure [Line Items]
Revenues		$ 124,000	$ 244,000
Number of customers accounted for 10% or more of consolidated revenues | Customer	0	1	1
Major Customer | Revenues | Customer Concentration Risk
Segment Reporting Disclosure [Line Items]
Percentage of sales revenues		14.00%	13.00%
Contract Drilling
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs | Rigs	295
Oil and gas services	$ 1,040,033	$ 543,663	$ 1,153,892
Contract Drilling | Canada
Segment Reporting Disclosure [Line Items]
Oil and gas services	13,700	15,600	$ 37,500
Long-lived assets	$ 52,000	$ 44,000

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Customers Accounting For Ten Percent Or More Of Net Revenue

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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