Supplemental Financial Information - Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Deferred contract costs	$ 45,736	$ 70,021
Prepaid taxes	45,621	54,412
Rig spare parts and supplies	17,873	20,256
Current contract assets	7,398	6,832
Prepaid insurance	4,490	2,742
Other	9,006	9,133
Total	$ 130,124	$ 163,396