Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

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Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts and notes [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 8,117 $ 1,544 $ 7,020
Charged to cost and expenses 5,092 4,264 2,258
Charged to other accounts 5,861 3,195 (2,034)
Deductions 6,217 886 5,700
Balance at end of year 12,853 8,117 1,544
Allowance for obsolete rig materials and supplies [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 312 316 309
Charged to cost and expenses 0 0 26
Charged to other accounts 3,586 0 0
Deductions 453 4 19
Balance at end of year 3,445 312 316
Deferred tax valuation allowance [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 4,805 6,467 5,532
Charged to cost and expenses 2,010 (1,662) 2,542
Charged to other accounts 12 0 (1,607)
Deductions 0 0 0
Balance at end of year $ 6,827 $ 4,805 $ 6,467