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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2009 Internal Revenue Service (IRS) [Member] Settlement with Taxing Authority [Member] | Sep. 30, 2013 Internal Revenue Service (IRS) [Member] Settlement with Taxing Authority [Member] | Dec. 31, 2012 Internal Revenue Service (IRS) [Member] Settlement with Taxing Authority [Member] | Sep. 30, 2013 Prior Period Adjustment [Member]
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Depreciation and other amortization | $ 28,604 | $ 28,552 | $ 84,791 | $ 89,138 |  |  |  |  | $ 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 |  |  |  |  |  |  |  | 500 |
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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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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