Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

v3.3.1.900
Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts and notes [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 11,188 $ 12,853 $ 8,117
Charged to cost and expenses 341 5,248 5,092
Charged to other accounts (825) 0 5,861
Deductions (2,010) (6,913) (6,217)
Balance at end of year 8,694 11,188 12,853
Allowance for obsolete rig materials and supplies [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 530 3,445 312
Charged to cost and expenses 0 0 0
Charged to other accounts 236 1 3,586
Deductions (140) (2,916) (453)
Balance at end of year 626 530 3,445
Deferred tax valuation allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 9,922 6,827 4,805
Charged to cost and expenses 40,676 2,800 2,010
Charged to other accounts 507 295 12
Deductions 0 0 0
Balance at end of year $ 51,105 $ 9,922 $ 6,827