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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |
Balance at December 31, 2012 | $ 625,385
Other comprehensive income before reclassifications | 99,960
Amounts reclassified from accumulated other comprehensive income | (5,274)
Total other comprehensive income, net of tax | 94,686
Balance at March 31, 2013 | 720,071
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |
Balance at December 31, 2012 | 651,272
Other comprehensive income before reclassifications | 100,180
Amounts reclassified from accumulated other comprehensive income | (6,082)
Total other comprehensive income, net of tax | 94,098
Balance at March 31, 2013 | 745,370
Loss on Foreign Currency Translation [Member] |
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |
Balance at December 31, 2012 | (20,027)
Other comprehensive income before reclassifications | (220)
Total other comprehensive income, net of tax | (220)
Balance at March 31, 2013 | (20,247)
Amortization of Postretirement Benefit [Member] |
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |
Balance at December 31, 2012 | (5,860)
Amounts reclassified from accumulated other comprehensive income | 808
Total other comprehensive income, net of tax | 808
Balance at March 31, 2013 | $ (5,052)

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- Definition Amounts Reclassified from Accumulated Other Comprehensive Income (Loss), Net of Tax + References No definition available. + Details
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- Definition This element represents the aggregate other comprehensive income, net of tax, prior to any reclassifications from accumulated other comprehensive income to the statements of operations during the period. + References No definition available. + Details
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- Definition Net of tax amount of other comprehensive income (loss) excluding noncontrolling interest. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -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 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. + Details
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