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Summary of Quarterly Financial Data (Unaudited) - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Jun. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 28,200,000 | $ 17,100,000 | $ 2,600,000 | $ (28,238,000) | $ (19,713,000) | $ (1,107,000)
Interest on notes |  |  |  |  |  | 5.00% | 5.00%
Net income includes impairment charges | 9,900,000 |  |  |  | 9,872,000 | 440,000 | 200,000
5.0 % Convertible Notes and 7.0% Senior Subordinated Notes Due 2022 [Member] |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |
Incremental interest incurred charge |  |  | 1,200,000 |  |  |  |
5.0 % Convertible Notes [Member] |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |
Interest on notes |  |  | 5.00% |  |  |  |
7.0% Notes [Member] |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |
Interest on notes |  |  | 7.00% |  |  |  |
9% Notes [Member] |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |
Incremental interest incurred charge |  | $ 800,000 |  |  |  |  |
Interest on notes |  | 9.00% |  |  |  |  |
5% Notes [Member] |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |
Interest on notes |  | 5.00% |  |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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