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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Investments [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance $ 12,779 $ 13,132 $ 12,954 $ 12,482
Total Realized and Unrealized Gains (Losses)   (78) 623 437
Purchases and Issuances 292 3 125 127
Sales and Settlements 2 (297) (728) (297)
Transfers In (Out) (99)     11
Ending Balance 12,974 12,760 12,974 12,760
Other [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 100    100 50
Total Realized and Unrealized Gains (Losses)         
Purchases and Issuances (100)    (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 2,094 3,907 2,647 2,347
Total Realized and Unrealized Gains (Losses) 235 (1,573) (318) (13)
Ending Balance 2,329 2,334 2,329 2,334
Mortgage and Other Asset-Backed Securities [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 52 98 40 16
Total Realized and Unrealized Gains (Losses) 7 (23) 14 (6)
Purchases and Issuances 50 3 73 83
Sales and Settlements (36) (64) (54) (79)
Transfers In (Out) (6) (2) (6) (2)
Ending Balance 67 12 67 12
Municipal Obligations [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 10,303 11,789 9,394 3,562
Total Realized and Unrealized Gains (Losses) 1,066 581 925 (497)
Purchases and Issuances 250   1,450 9,305
Sales and Settlements (50) (2,250) (200) (2,250)
Ending Balance 11,569 10,120 11,569 10,120
Other [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Beginning Balance 62,489 66,831 62,963 65,001
Total Realized and Unrealized Gains (Losses) (571) 738 (1,120) (761)
Purchases and Issuances 5,925 4,425 8,975 14,725
Sales and Settlements (1,100) (7,350) (4,075) (14,321)
Ending Balance $ 66,743 $ 64,644 $ 66,743 $ 64,644