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Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance $ 27,705 $ 52,052 $ 23,384 $ 54,028 $ 54,028
Other comprehensive income (loss) before reclassification (6,686) 11,705 (566) 13,761  
Amounts reclassified from accumulated other comprehensive income (loss) (917) (29,756) (2,716) (33,788)  
Other comprehensive income (loss), net of taxes (7,603) (18,051) (3,282) (20,027)  
Ending balance 20,102 34,001 20,102 34,001 23,384
Unrealized Gains and Losses on Available for Sale Securities          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance 28,206 51,958 23,647 53,950 53,950
Other comprehensive income (loss) before reclassification (6,845) 11,664 (404) 13,691  
Amounts reclassified from accumulated other comprehensive income (loss) (1,160) (29,694) (3,042) (33,713)  
Other comprehensive income (loss), net of taxes (8,005) (18,030) (3,446) (20,022)  
Ending balance 20,201 33,928 20,201 33,928 23,647
Foreign Currency Items          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance (501) 94 (263) 78 78
Other comprehensive income (loss) before reclassification 159 41 (162) 70  
Amounts reclassified from accumulated other comprehensive income (loss) 243 (62) 326 (75)  
Other comprehensive income (loss), net of taxes 402 (21) 164 (5)  
Ending balance $ (99) $ 73 $ (99) $ 73 $ (263)