Supplemental Financial Information - Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Deferred contract costs	$ 26,252	$ 70,021
Rig spare parts and supplies	17,331	20,256
Current contract assets	8,638	6,832
Prepaid rig costs	4,041	5,247
Prepaid insurance	3,587	2,742
Prepaid taxes	826	54,412
Other	5,994	3,886
Total	$ 66,669	$ 163,396