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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Changes in Operating Assets and Liabilities |
a) | The changes in operating assets and liabilities for the years ended December 31, 2012, 2011, and 2010, are as follows:
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Accounts receivable |  |  | (132,873 | ) |  |  | (68,914 | ) |  |  | (21,820 | )
Prepaid expenses and other assets |  |  | 19,741 |  |  |  | (8,225 | ) |  |  | 12,719 |
Accounts payable |  |  | 18,408 |  |  |  | 12,216 |  |  |  | (11,002 | )
Accrued and other liabilities |  |  | (20,485 | ) |  |  | (19,424 | ) |  |  | 65,518 |
|  |  | (115,209 | ) |  |  | (84,347 | ) |  |  | 45,415 |

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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration