Supplemental Financial Information - Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Rig operating expenses	$ 87,069	$ 70,078
Payroll and benefits	107,210	88,612
Deferred revenue	34,457	71,699
Accrued capital project/upgrade costs	74,308	56,595
Interest payable	29,422	21,219
Personal injury and other claims	10,065	10,312
FOREX contracts	4,304	29
Other	7,397	5,890
Total	$ 354,232	$ 324,434