Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Investments, Owned, Federal Income Tax Note [Line Items]
Federal statutory rate			35.00%	35.00%
Income Tax Expense (Benefit)	$ 0	$ 0	$ 0	$ 0
Valuation allowance for deferred tax assets	108,363		108,363		$ 130,946
Unrecognized income tax benefit, net	3,404		3,404		3,404	$ 3,041
Unrecognized income tax benefit, gross	9,727		9,727		9,727
Operating loss carry forward	623,721		$ 623,721		577,762
Operating loss carry forward, expiration period			15 years
Alternative minimum tax credit carry forward	4,216		$ 4,216		4,216
Penalties expense related to federal income tax			0		0
Interest (income)/expense related to federal income tax			(63)		86
Capital contributions from AEGON USA, LLC				$ 6,842	68,492
Capital distribution payable to Transamerica Corporation /AEGON USA, LLC	13,489		13,489
Foreign
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credit carry forward	9,203		$ 9,203		$ 8,869
Foreign tax credit carry forward, expiration date in year			10 years		10 years
Capital Loss Carry forward
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credit carry forward	$ 84		$ 84		$ 84
Capital loss tax credit carry forward, expiration date in year			5 years		5 years
Capital loss tax credit carry forward, expiration year			2018
Earliest Tax Year
Investments, Owned, Federal Income Tax Note [Line Items]
Operating loss carry forward, expiration year			2023
Latest Tax Year
Investments, Owned, Federal Income Tax Note [Line Items]
Operating loss carry forward, expiration year			2031
Latest Tax Year | Foreign
Investments, Owned, Federal Income Tax Note [Line Items]
Foreign tax credit carry forward, expiration year			2026