Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

v3.19.1
Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for bad debt      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 7,564 $ 8,259 $ 8,694
Charged to cost and expenses 309 444 1,483
Charged to other accounts (47) (414) 4
Deductions (59) (725) (1,922)
Balance at end of year 7,767 7,564 8,259
Allowance for obsolete rig materials and supplies      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 809 1,166 626
Charged to cost and expenses 1,041 65 978
Charged to other accounts 0 0 (3)
Deductions (303) (422) (435)
Balance at end of year 1,547 809 1,166
Deferred tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 157,914 171,133 51,105
Charged to cost and expenses 28,353 (14,625) 117,707
Charged to other accounts 0 1,406 2,321
Deductions 0 0 0
Balance at end of year $ 186,267 $ 157,914 $ 171,133