Business Segments - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Rigs Segment Customer	Dec. 31, 2014 USD ($) Customer	Dec. 31, 2013 USD ($) Customer
Segment Reporting Disclosure [Line Items]
Number of reportable business segments | Segment	3
Long-lived assets	$ 3,920,708	$ 4,131,071
Major Customer
Segment Reporting Disclosure [Line Items]
Revenues	$ 244,000		$ 286,000
Number of customers accounted for 10% or more of consolidated revenues | Customer	1	0	1
Major Customer | Revenues | Customer Concentration Risk
Segment Reporting Disclosure [Line Items]
Percentage of sales revenues	13.00%		10.50%
Contract Drilling
Segment Reporting Disclosure [Line Items]
Marketable land-based drilling rigs | Rigs	221
Oil and gas services	$ 1,153,892	$ 1,838,830	$ 1,679,611
Contract Drilling | Canada
Segment Reporting Disclosure [Line Items]
Oil and gas services	37,500	87,500	$ 86,600
Long-lived assets	$ 53,400	$ 57,600