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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Internal Revenue Service (IRS) [Member] Settlement with Taxing Authority [Member] | Dec. 31, 2009 Internal Revenue Service (IRS) [Member] Settlement with Taxing Authority [Member] | Mar. 31, 2013 Prior Period Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Depreciation and Other Amortization | $ 27,307 | $ 32,009 |  |  |  | $ 1,640
Period to carry back net operating losses |  |  |  | up to 5 years |  |
IRS Tax Refund |  |  |  |  | 40,418 |
Refunds in excess are required to be reviewed by Joint Committee on Taxation |  |  |  | 2,000 |  |
Agreed Refund Adjustment to Taxable Income |  |  |  | 13,700 |  |
Taxes Owed |  |  |  | 4,806 |  |
Accrued Interest |  |  |  | 490 |  |
Preferred Stock Distributions Taxable as Capital Gain |  |  |  | $ 8,238 |  |
Long Term Capital Gains as a Percentage of Distributions |  |  | 35.42% |  |  |
Return Of Capital as a Percentage of Distributions |  |  | 64.58% |  |  |

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