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Schedule of Credit Losses Recognized in Earnings (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]        
Balance at beginning of period $ 50 $ 54 $ 50 $ 54
Additions where no OTTI was previously recorded 0 0 0 0
Additions where an OTTI was previously recorded 0 0 0 0
Reductions for securities for which the company intends to sell or more likely than not will be required to sell before recovery 0 0 0 0
Reductions reflecting increases in expected cash flows to be collected 0 0 0 0
Reductions for securities sold during the period (19) (4) (19) (4)
Balance at end of period $ 31 $ 50 $ 31 $ 50