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Long-Term Debt Senior Notes (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Jun. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 09, 2013 5½% Senior Notes [Member] Senior Notes [Member] | Sep. 09, 2013 5½% Senior Notes [Member] Prior to August 1, 2016 Senior Notes [Member] | Sep. 09, 2013 5½% Senior Notes [Member] Prior to August 1, 2017 Senior Notes [Member] | Mar. 23, 2012 5% Senior Notes due 2020 [Member] Senior Notes [Member] | Mar. 23, 2012 5% Senior Notes due 2020 [Member] Prior to April 01, 2016 Senior Notes [Member] | Mar. 23, 2012 5% Senior Notes due 2020 [Member] Prior to April 1, 2015 Senior Notes [Member] | Mar. 23, 2012 5% Senior Notes due 2020 [Member] Prior to April 1, 2016 Senior Notes [Member] | Apr. 09, 2012 7.25 % Senior Notes [Member] Senior Notes [Member] | Jun. 30, 2012 7.25 % Senior Notes [Member] Senior Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 300,000,000 |  |  | $ 500,000,000 |  |  |  |  |
Debt Instrument Offering Price Percentage |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |
Debt Instrument Redemption Date |  |  |  |  |  |  | August 1, 2016 | August 1, 2017 |  | April 1, 2016 | April 1, 2015 | April 1, 2016 |  |
Maximum Redemption Percent Allowed And Limited To Proceeds From Equity Offering |  |  |  |  |  |  | 35.00% |  |  |  | 35.00% |  |  |
Debt Redemption Price Percent Of Principal Amount |  |  |  |  |  |  | 105.50% | 100.00% |  |  | 105.00% | 100.00% | 112.3715% |
Redemption Price Percent If Change In Control Occurs |  |  |  |  |  | 101.00% |  |  | 101.00% |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |
Early Repayment of Subordinated Debt |  |  |  |  |  |  |  |  |  |  |  |  | 280,900,000 |
Loss on early extinguishment of debt | $ (2,100,000) | $ (38,700,000) | $ (2,068,000) | $ (38,704,000) | $ (976,000) |  |  |  |  |  |  |  |  | $ (38,700,000)

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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