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Reconciliation of Beginning and Ending Balances for all Investments Measured at Fair Value Using Level 3 Inputs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Realized Gains (Losses)      
Unrealized Gains (Losses) (15) (15)
Purchases 4,661 4,661
Sales (84) (84)
Settlements      
Transfers into Level 3      
Transfers out of Level 3      
Ending Balance 4,562 4,562
Corporate bonds
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Realized Gains (Losses)      
Unrealized Gains (Losses) (15) (15)
Purchases 4,661 4,661
Sales (84) (84)
Settlements      
Transfers into Level 3      
Transfers out of Level 3      
Ending Balance $ 4,562 $ 4,562