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Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | $ 12,974 | $ 12,760 | $ 12,954 | $ 12,482
Total Realized and Unrealized Gains (Losses) | (413) | (41) | 210 | 396
Purchases and Issuances | 1,000 | 231 | 1,000 | 358
Sales and Settlements | (7,435) | (145) | (8,038) | (442)
Transfers In (Out) |  |  |  | 11
Ending Balance | 6,126 | 12,805 | 6,126 | 12,805
Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance |  |  | 100 | 50
Total Realized and Unrealized Gains (Losses) |  |  |  |
Purchases and Issuances |  |  | 100 | 50
Sales and Settlements |  |  |  |
Transfers In (Out) |  |  |  |
Ending Balance |  |  |  |
Derivative Contracts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 2,329 | 2,334 | 2,647 | 2,347
Total Realized and Unrealized Gains (Losses) | (83) | 81 | 235 | 94
Ending Balance | 2,412 | 2,253 | 2,412 | 2,253
Mortgage and Other Asset-Backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 67 | 12 | 40 | 16
Total Realized and Unrealized Gains (Losses) |  | 3 |  | (3)
Purchases and Issuances |  | 11 |  | 95
Sales and Settlements | (8) |  | (8) | (80)
Transfers In (Out) | (59) |  | (32) | (2)
Ending Balance |  | 26 |  | 26
Municipal Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 11,569 | 10,120 | 9,394 | 3,562
Total Realized and Unrealized Gains (Losses) | (192) | (13) | 733 | (510)
Purchases and Issuances | 2,275 | 655 | 3,725 | 9,960
Sales and Settlements | (150) | (90) | (350) | (2,340)
Ending Balance | 13,502 | 10,672 | 13,502 | 10,672
Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 66,743 | 64,644 | 62,963 | 65,001
Total Realized and Unrealized Gains (Losses) | (53) | 410 | (1,173) | (351)
Purchases and Issuances | 475 | 5,950 | 9,450 | 20,675
Sales and Settlements |  | (4,625) | (4,075) | (18,946)
Ending Balance | $ 67,165 | $ 66,379 | $ 67,165 | $ 66,379

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- Definition Fair value liabilities measured on recurring basis change in realized and unrealized gain (loss) included in other income. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset purchases sales issuances settlements. + References No definition available. + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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