Quarterly report pursuant to Section 13 or 15(d)

Balance Sheets (Detail)

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Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Current assets:        
Cash and cash equivalents $ 114,127 $ 97,869 $ 103,083 $ 51,431
Accounts and notes receivable, net 160,449 183,923    
Rig materials and supplies 22,934 29,947    
Deferred costs 1,209 3,249    
Deferred income taxes 6,615 6,650    
Other tax assets 29,016 25,358    
Assets held for sale 11,656 5,315    
Other current assets 12,199 15,302    
Total current assets 358,205 367,613    
Property, plant and equipment, net 773,244 719,809    
Other noncurrent assets 25,854 20,513    
Total assets 1,256,889 1,216,246    
Current liabilities:        
Current portion of long-term debt 43,000 145,723    
Accounts payable and accrued liabilities 129,712 135,250    
Accrued income taxes 5,242 4,837    
Total current liabilities 177,954 285,810    
Long-term debt 429,462 337,000    
Other long-term liabilities 25,270 33,452    
Long-term deferred tax liability 15,578 15,934    
Contingencies          
Stockholders' equity:        
Common stock 19,753 19,508    
Capital in excess of par value 644,107 637,042    
Retained earnings (accumulated deficit) (54,533) (111,944)    
Total controlling interest stockholders' equity 609,327 544,606    
Noncontrolling interest (702) (556)    
Total Equity 608,625 544,050    
Total liabilities and stockholders' equity 1,256,889 1,216,246    
Parent [Member]
       
Current assets:        
Cash and cash equivalents 77,468 55,670 60,728 13,835
Accounts and notes receivable, net 289,803 289,512    
Other tax assets 81,077 47,834    
Other current assets 525 788    
Total current assets 448,873 393,804    
Property, plant and equipment, net 60 79    
Investment in subsidiaries and intercompany advances 733,876 720,214    
Other noncurrent assets 41,336 44,962    
Total assets 1,224,145 1,159,059    
Current liabilities:        
Current portion of long-term debt 43,000 145,723    
Accounts payable and accrued liabilities 74,494 60,120    
Accrued income taxes (1,014) (205)    
Total current liabilities 116,480 205,638    
Long-term debt 429,462 337,000    
Other long-term liabilities 3,933 8,081    
Long-term deferred tax liability 2,359 1,151    
Intercompany payables 62,583 62,583    
Contingencies          
Stockholders' equity:        
Common stock 19,753 19,508    
Capital in excess of par value 644,108 637,042    
Retained earnings (accumulated deficit) (54,533) (111,944)    
Total controlling interest stockholders' equity 609,328 544,606    
Total Equity 609,328 544,606    
Total liabilities and stockholders' equity 1,224,145 1,159,059    
Guarantor [Member]
       
Current assets:        
Cash and cash equivalents 7,907 4,212 17,599 2,317
Accounts and notes receivable, net 97,085 94,748    
Rig materials and supplies (796) 762    
Deferred income taxes 5,540 5,311    
Other tax assets (55,655) (25,218)    
Other current assets 4,091 6,381    
Total current assets 58,172 86,196    
Property, plant and equipment, net 531,448 474,942    
Investment in subsidiaries and intercompany advances (199,435) (212,883)    
Other noncurrent assets 68,415 66,660    
Total assets 458,600 414,915    
Current liabilities:        
Accounts payable and accrued liabilities 75,832 94,056    
Accrued income taxes 2,227 921    
Total current liabilities 78,059 94,977    
Other long-term liabilities 6,287 9,474    
Long-term deferred tax liability 29,945 25,232    
Intercompany payables 43,657 43,657    
Contingencies          
Stockholders' equity:        
Common stock 18,049 18,049    
Capital in excess of par value 733,111 733,120    
Retained earnings (accumulated deficit) (450,508) (509,594)    
Total controlling interest stockholders' equity 300,652 241,575    
Total Equity 300,652 241,575    
Total liabilities and stockholders' equity 458,600 414,915    
Non-Guarantor [Member]
       
Current assets:        
Cash and cash equivalents 28,752 37,987 24,756 35,279
Accounts and notes receivable, net 287,958 285,326    
Rig materials and supplies 23,730 29,185    
Deferred costs 1,209 3,249    
Deferred income taxes 1,075 853    
Other tax assets 3,594 2,742    
Assets held for sale 11,656 5,315    
Other current assets 7,583 8,133    
Total current assets 365,557 372,790    
Property, plant and equipment, net 241,736 244,787    
Investment in subsidiaries and intercompany advances 1,382,500 1,347,719    
Other noncurrent assets 15,689 16,839    
Total assets 2,005,482 1,982,135    
Current liabilities:        
Accounts payable and accrued liabilities 208,112 181,010    
Accrued income taxes 4,029 4,121    
Total current liabilities 212,141 185,131    
Other long-term liabilities 15,050 15,897    
Long-term deferred tax liability (16,726) (11,296)    
Intercompany payables 103,625 111,619    
Contingencies          
Stockholders' equity:        
Common stock 43,003 43,003    
Capital in excess of par value 1,452,440 1,444,091    
Retained earnings (accumulated deficit) 196,651 194,246    
Total controlling interest stockholders' equity 1,692,094 1,681,340    
Noncontrolling interest (702) (556)    
Total Equity 1,691,392 1,680,784    
Total liabilities and stockholders' equity 2,005,482 1,982,135    
Eliminations [Member]
       
Current assets:        
Accounts and notes receivable, net (514,397) (485,663)    
Deferred income taxes   486    
Total current assets (514,397) (485,177)    
Property, plant and equipment, net   1    
Investment in subsidiaries and intercompany advances (1,916,941) (1,855,050)    
Other noncurrent assets   363    
Total assets (2,431,338) (2,339,863)    
Current liabilities:        
Accounts payable and accrued liabilities (228,726) (199,936)    
Total current liabilities (228,726) (199,936)    
Long-term deferred tax liability   847    
Intercompany payables (209,865) (217,859)    
Contingencies          
Stockholders' equity:        
Common stock (61,052) (61,052)    
Capital in excess of par value (2,185,552) (2,177,211)    
Retained earnings (accumulated deficit) 253,857 315,348    
Total controlling interest stockholders' equity (1,992,747) (1,922,915)    
Total Equity (1,992,747) (1,922,915)    
Total liabilities and stockholders' equity $ (2,431,338) $ (2,339,863)