Segments and Geographic Area Analysis - Individual Countries that Comprised 5% or More of Our Total Contract Drilling Revenues from Unaffiliated Customers (Detail) (Revenues [Member], Geographic Concentration Risk [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Brazil [Member]
Segment Reporting Information [Line Items]
Percentage of total drilling revenues from unaffiliated customers	38.30%	46.10%	49.40%
United Kingdom [Member]
Segment Reporting Information [Line Items]
Percentage of total drilling revenues from unaffiliated customers	7.90%	6.90%	4.60%
Australia [Member]
Segment Reporting Information [Line Items]
Percentage of total drilling revenues from unaffiliated customers	3.20%	6.70%	6.70%
Mexico [Member]
Segment Reporting Information [Line Items]
Percentage of total drilling revenues from unaffiliated customers	6.90%	6.60%	1.90%
Angola [Member]
Segment Reporting Information [Line Items]
Percentage of total drilling revenues from unaffiliated customers	3.80%	2.70%	9.60%
Indonesia [Member]
Segment Reporting Information [Line Items]
Percentage of total drilling revenues from unaffiliated customers	4.40%	2.40%	5.00%