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Schedule of Effects of Reinsurance on Premiums and Contract Charges (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effects of Reinsurance [Line Items]      
Direct premiums and contract charges $ 1,246,952 $ 1,294,462 $ 1,328,917
Assumed premiums and contract charges 5,118 4,768 4,749
Ceded premiums and contract charges (900,842) (949,894) (971,047)
Net amount $ 351,228 $ 349,336 $ 362,619