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Schedule - I - Summary of Investments Other Than Investments in Related Parties (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | $ 5,678,660
Estimated Fair Value | 6,329,932
Amount at which shown in the balance sheet | 6,329,932
U.S. government obligations [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 392,554
Estimated Fair Value | 393,062
Amount at which shown in the balance sheet | 393,062
U.S. agency obligations [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 79,295
Estimated Fair Value | 82,535
Amount at which shown in the balance sheet | 82,535
Municipal obligations [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 1,632,637
Estimated Fair Value | 1,814,730
Amount at which shown in the balance sheet | 1,814,730
Residential mortgage-backed securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 1,096,202
Estimated Fair Value | 1,455,582
Amount at which shown in the balance sheet | 1,455,582
Collateralized debt obligations [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 32,855
Estimated Fair Value | 33,342
Amount at which shown in the balance sheet | 33,342
Other asset-backed securities [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 687,410
Estimated Fair Value | 706,637
Amount at which shown in the balance sheet | 706,637
Corporate obligations [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 1,029,041
Estimated Fair Value | 1,112,174
Amount at which shown in the balance sheet | 1,112,174
Foreign obligations [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 67,347
Estimated Fair Value | 70,112
Amount at which shown in the balance sheet | 70,112
Short-term [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 661,219
Estimated Fair Value | 661,658
Amount at which shown in the balance sheet | 661,658
Other [Member] |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Amortized Cost | 100
Estimated Fair Value | 100
Amount at which shown in the balance sheet | $ 100

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- Definition This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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