Segments and Geographic Area Analysis - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments	1
Number of countries with rigs	12
Geographic Concentration Risk [Member] | Long-lived tangible assets [Member]
Segment Reporting Information [Line Items]
Concentration risk benchmark	No other countries had more than a 5% concentration	No other countries had more than a 5% concentration	No other countries had more than a 5% concentration
Geographic Concentration Risk [Member] | Contract Drilling Revenues [Member]
Segment Reporting Information [Line Items]
Concentration risk benchmark	Individual countries that comprised 5% or more of our total contract drilling revenues	Individual countries that comprised 5% or more of our total contract drilling revenues	Individual countries that comprised 5% or more of our total contract drilling revenues
Customer Concentration Risk [Member] | Revenues [Member]
Segment Reporting Information [Line Items]
Concentration risk benchmark	Contributed more than 10% of our total revenues	Contributed more than 10% of our total revenues	Contributed more than 10% of our total revenues