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OTHER COMPREHENSIVE LOSS - Change in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ (40,415,000)  
Amounts reclassified from accumulated comprehensive loss $ 0 $ 0 0 $ 0
Ending balance (2,438,000)   (2,438,000)  
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Debt Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (19,905,000) (44,662,000) (40,415,000) (20,608,000)
Other comprehensive income (loss) 17,467,000 (7,445,000) 37,977,000 (31,499,000)
Ending balance (2,438,000) (52,107,000) (2,438,000) (52,107,000)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Equity Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 0 0 0 (6,000)
Other comprehensive income (loss) 0 0 0 0
Amounts reclassified from accumulated comprehensive loss 0 0 0 6,000
Ending balance $ 0 $ 0 $ 0 $ 0