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OTHER COMPREHENSIVE LOSS - Change in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ (20,615)  
Ending balance $ (62,887)   (62,887)  
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Debt Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (52,107) $ (14,625) (20,609) $ (34,383)
Other comprehensive (loss) income (10,780) 3,719 (42,278) 11,617
Amounts reclassified from accumulated comprehensive loss 0 0 0 11,860
Ending balance (62,887) (10,906) (62,887) (10,906)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Equity Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 0 (4) (6) (7)
Other comprehensive (loss) income 0 0 0 3
Amounts reclassified from accumulated comprehensive loss 0 0 6 0
Ending balance $ 0 $ (4) $ 0 $ (4)