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Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) - Other Invested Assets
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 0
Included in realized gains (losses) 486
Purchases 27,303
Sales (27,864)
Ending balance 0
Amortization of Bond Premium and Discount, Net  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Investment Income $ 75