Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Tax DAC	$ 1,205	$ 14,992
Net operating and capital loss carryforward	116,117	228,864
Intangible assets	14,786	29,824
Transitional reserve amount	8,849
Policyholder reserves	17,189	29,546
Tax credits	19,511	13,992
Other	1,999	1,714
Total deferred tax assets	179,656	318,932
Valuation allowance	(78,697)	(154,440)
Net deferred tax assets	100,959	164,492
Deferred tax liabilities
VOBA	51,553	95,150
Policyholder reserves	8,050	20,106
Transitional reserve amount	3,988
Investments	39,158	48,660
Other	36
Total deferred tax liabilities	102,785	163,916
Total net deferred tax liability	$ (1,826)
Total net deferred tax asset		$ 576