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Condensed Consolidated Guarantor And Non-Guarantor Financial Information (Schedule Of Condensed Consolidating Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 620,449 | $ 546,465 | $ 440,531 | $ 391,085
Accounts receivable, net | 237,417 | 238,781 |  |
Unbilled revenue | 24,576 | 37,375 |  |
Other current assets | 109,669 | 121,621 |  |
Total current assets | 992,111 | 944,242 |  |
Property and equipment, net | 2,361,687 | 2,331,327 |  |
Equity investments in unconsolidated affiliates | 173,440 | 175,656 |  |
Goodwill, net | 62,667 | 62,215 |  |
Other assets, net | 75,038 | 68,907 |  |
Total assets | 3,664,943 | 3,582,347 |  |
Accounts payable | 145,631 | 147,043 |  |
Accrued liabilities | 196,814 | 239,963 |  |
Income taxes payable | 24,977 | 1,293 |  |
Current maturities of long-term debt | 12,997 | 7,877 |  |
Total current liabilities | 380,419 | 396,176 |  |
Long-term debt | 1,167,486 | 1,147,444 |  |
Deferred income taxes | 423,098 | 417,610 |  |
Asset retirement obligations | 146,696 | 161,208 |  |
Other long-term liabilities | 16,516 | 9,368 |  |
Total liabilities | 2,134,215 | 2,131,806 |  |
Convertible preferred stock | 1,000 | 1,000 |  |
Total equity | 1,529,728 | 1,449,541 |  |
Total liabilities and shareholders' equity | 3,664,943 | 3,582,347 |  |
Helix [Member] |  |  |  |
Cash and cash equivalents | 566,287 | 495,484 | 425,514 | 376,434
Accounts receivable, net | 50,886 | 79,290 |  |
Unbilled revenue | 5,777 | 10,530 |  |
Income taxes receivable | 86,005 | 80,388 |  |
Other current assets | 54,484 | 68,627 |  |
Total current assets | 763,439 | 734,319 |  |
Intercompany | (157,195) | (147,187) |  |
Property and equipment, net | 227,620 | 230,946 |  |
Equity investments in affiliates | 2,019,076 | 1,952,392 |  |
Other assets, net | 54,828 | 53,425 |  |
Due from subsidiaries/parent | 56,189 | 64,655 |  |
Total assets | 2,963,957 | 2,888,550 |  |
Accounts payable | 42,316 | 39,280 |  |
Accrued liabilities | 68,627 | 115,921 |  |
Current maturities of long-term debt | 8,000 | 3,000 |  |
Total current liabilities | 118,943 | 158,201 |  |
Long-term debt | 1,064,726 | 1,042,155 |  |
Deferred income taxes | 234,567 | 231,255 |  |
Other long-term liabilities | 4,163 | 4,150 |  |
Total liabilities | 1,422,399 | 1,435,761 |  |
Convertible preferred stock | 1,000 | 1,000 |  |
Total equity | 1,540,558 | 1,451,789 |  |
Total liabilities and shareholders' equity | 2,963,957 | 2,888,550 |  |
Guarantors [Member] |  |  |  |
Cash and cash equivalents | 2,498 | 2,434 | 2,473 | 3,294
Accounts receivable, net | 118,038 | 117,767 |  |
Unbilled revenue | 228 | 155 |  |
Other current assets | 45,654 | 48,661 |  |
Total current assets | 166,418 | 169,017 |  |
Intercompany | 340,018 | 315,821 |  |
Property and equipment, net | 1,456,602 | 1,422,326 |  |
Equity investments in affiliates | 39,864 | 37,239 |  |
Goodwill, net | 45,107 | 45,107 |  |
Other assets, net | 36,566 | 36,453 |  |
Due from subsidiaries/parent | 509,701 | 430,496 |  |
Total assets | 2,594,276 | 2,456,459 |  |
Accounts payable | 67,950 | 82,750 |  |
Accrued liabilities | 107,284 | 97,692 |  |
Income taxes payable | 128,808 | 97,692 |  |
Total current liabilities | 304,042 | 278,134 |  |
Deferred income taxes | 90,526 | 88,625 |  |
Asset retirement obligations | 146,696 | 161,208 |  |
Other long-term liabilities | 11,803 | 4,647 |  |
Total liabilities | 553,067 | 532,614 |  |
Total equity | 2,041,209 | 1,923,845 |  |
Total liabilities and shareholders' equity | 2,594,276 | 2,456,459 |  |
Non-Guarantors [Member] |  |  |  |
Cash and cash equivalents | 51,664 | 48,547 | 12,544 | 11,357
Accounts receivable, net | 68,493 | 41,724 |  |
Unbilled revenue | 18,571 | 26,690 |  |
Income taxes receivable | 1,586 |  |  |
Other current assets | 9,864 | 10,159 |  |
Total current assets | 150,178 | 127,120 |  |
Intercompany | (107,547) | (102,826) |  |
Property and equipment, net | 682,200 | 682,899 |  |
Equity investments in unconsolidated affiliates | 173,440 | 175,656 |  |
Goodwill, net | 17,560 | 17,108 |  |
Other assets, net | 21,475 | 16,809 |  |
Total assets | 937,306 | 916,766 |  |
Accounts payable | 35,365 | 25,013 |  |
Accrued liabilities | 20,903 | 26,350 |  |
Income taxes payable |  | 217 |  |
Current maturities of long-term debt | 4,997 | 10,377 |  |
Total current liabilities | 61,265 | 61,957 |  |
Long-term debt | 102,760 | 105,289 |  |
Deferred income taxes | 103,861 | 103,552 |  |
Other long-term liabilities | 550 | 571 |  |
Due to parent | 89,821 | 98,285 |  |
Total liabilities | 358,257 | 369,654 |  |
Total equity | 579,049 | 547,112 |  |
Total liabilities and shareholders' equity | 937,306 | 916,766 |  |
Consolidating Entries [Member] |  |  |  |
Income taxes receivable | (87,591) | (80,388) |  |
Other current assets | (333) | (5,826) |  |
Total current assets | (87,924) | (86,214) |  |
Intercompany | (75,276) | (65,808) |  |
Property and equipment, net | (4,735) | (4,844) |  |
Equity investments in affiliates | (2,058,940) | (1,989,631) |  |
Other assets, net | (37,831) | (37,780) |  |
Due from subsidiaries/parent | (565,890) | (495,151) |  |
Total assets | (2,830,596) | (2,679,428) |  |
Income taxes payable | (103,831) | (96,616) |  |
Current maturities of long-term debt |  | (5,500) |  |
Total current liabilities | (103,831) | (102,116) |  |
Deferred income taxes | (5,856) | (5,822) |  |
Due to parent | (89,821) | (98,285) |  |
Total liabilities | (199,508) | (206,223) |  |
Total equity | (2,631,088) | (2,473,205) |  |
Total liabilities and shareholders' equity | $ (2,830,596) | $ (2,679,428) |  |

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