Supplemental Financial Information - Prepaid Expenses and Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Rig spare parts and supplies	$ 52,195	$ 57,558
Deferred mobilization costs	23,974	38,074
Prepaid insurance	20,329	12,549
Deferred tax assets	8,619	8,619
Prepaid taxes	25,892	5,950
FOREX contracts	3,272	3,627
Other	7,871	9,722
Total	$ 142,152	$ 136,099