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OTHER COMPREHENSIVE LOSS - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain on sale of investments $ 0 $ 0 $ 0 $ 371
Net impairment losses on available-for-sale debt securities 0 0 0 12,231
Total before tax 48,655 (19,150) 130,752 35,606
Income tax 12,332 (8,398) 30,249 (7,181)
Net income 36,323 (10,752) 100,503 42,787
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain on sale of investments 0 0 0 371
Net impairment losses on available-for-sale debt securities 0 0 0 (12,231)
Total before tax 0 0 0 (11,860)
Income tax 0 0 0 0
Net income $ 0 $ 0 $ 0 $ (11,860)