Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related Party Transaction [Line Items]
Expense incurred as result of multiple service agreements		$ 2,466	$ 2,818	$ 7,936	$ 8,438
Intercompany short-term note receivable	50,000	50,000		50,000
Interest on intercompany note receivable	0.10%
Intercompany short-term note receivable, due date	May 21, 2014
Interest income accrued and/or received due to intercompany arrangements		12		18
Fixed maturity AFS securities purchased from affiliated companies				731,970	458,895
Sale of fixed maturity AFS securities		313,083	127,151	335,385	239,298
AEGON USA Realty Advisors, LLC
Related Party Transaction [Line Items]
Expense incurred as result of multiple service agreements		22	21	69	65
Aegon Usa Investment Management Llc
Related Party Transaction [Line Items]
Expense incurred as result of multiple service agreements		261	418	1,185	1,275
Transamerica Capital, Inc.
Related Party Transaction [Line Items]
Expense incurred as result of multiple service agreements		8,090	8,294	24,426	24,619
Transamerica Asset Management, Inc.
Related Party Transaction [Line Items]
Expense incurred as result of multiple service agreements		102	100	305	301
Distribution and shareholder services agreement
Related Party Transaction [Line Items]
Revenue from participation agreement		496	434	1,363	1,314
Affiliated companies | Fixed maturity AFS securities
Related Party Transaction [Line Items]
Fixed maturity AFS securities purchased from affiliated companies			40,194		55,294
Sale of fixed maturity AFS securities					$ 9,174