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Hierarchy of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Fixed maturity AFS securities, at estimated fair value $ 1,294,321 $ 1,548,638
Equity securities 28,126  
Equity AFS securities   28,497
Derivative assets 5,352 8,212
Fair value recoverable of ceded guaranteed minimum income benefits ("GMIB") embedded derivatives 23,259 25,325
Investments measured at net asset value (“NAV”) 5,600,806 5,795,209
Liabilities    
Derivative liabilities 1,716 2,226
Corporate securities    
Assets    
Fixed maturity AFS securities, at estimated fair value 853,648 942,024
Asset-backed securities    
Assets    
Fixed maturity AFS securities, at estimated fair value 50,206 56,906
Commercial mortgage-backed securities    
Assets    
Fixed maturity AFS securities, at estimated fair value 60,653 73,321
Residential mortgage-backed securities    
Assets    
Fixed maturity AFS securities, at estimated fair value 43,571 81,417
Municipals    
Assets    
Fixed maturity AFS securities, at estimated fair value 884 881
Government and government agencies - United States    
Assets    
Fixed maturity AFS securities, at estimated fair value 254,469 362,119
Government and government agencies - Foreign    
Assets    
Fixed maturity AFS securities, at estimated fair value 25,290 26,280
Redeemable preferred stock    
Assets    
Fixed maturity AFS securities, at estimated fair value 5,600 5,690
Banking securities    
Assets    
Equity securities 28,126  
Equity AFS securities   28,497
Fair Value, Measurements, Recurring    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 1,294,321 1,548,638
Equity securities 28,126  
Equity AFS securities [1]   28,497
Cash equivalents [2] 406,944 268,753
Derivative assets [3] 5,352 8,212
Fair value recoverable of ceded guaranteed minimum income benefits ("GMIB") embedded derivatives [4] 23,259 25,325
Investments measured at net asset value (“NAV”) 5,600,806 [5] 5,795,209 [6]
Total assets 7,358,808 7,674,634
Liabilities    
Future policy benefits (embedded derivatives only) [7] 34,811 38,471
Derivative liabilities [3] 1,716 2,226
Total liabilities 36,527 40,697
Fair Value, Measurements, Recurring | Level 1    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 255,900 363,563
Cash equivalents [2] 155,655 20,812
Total assets 411,555 384,375
Fair Value, Measurements, Recurring | Level 2    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 1,034,335 1,180,811
Equity securities 28,126  
Equity AFS securities [1]   28,497
Cash equivalents [2] 251,289 247,941
Derivative assets [3] 5,352 8,212
Total assets 1,319,102 1,465,461
Liabilities    
Derivative liabilities [3] 1,716 2,226
Total liabilities 1,716 2,226
Fair Value, Measurements, Recurring | Level 3    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 4,086 4,264
Fair value recoverable of ceded guaranteed minimum income benefits ("GMIB") embedded derivatives [4] 23,259 25,325
Total assets 27,345 29,589
Liabilities    
Future policy benefits (embedded derivatives only) [7] 34,811 38,471
Total liabilities 34,811 38,471
Fair Value, Measurements, Recurring | Corporate securities    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 853,648 942,024
Fair Value, Measurements, Recurring | Corporate securities | Level 2    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 853,648 942,024
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 50,206 56,906
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 46,120 52,642
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 4,086 4,264
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 60,653 73,321
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Level 2    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 60,653 73,321
Fair Value, Measurements, Recurring | Residential mortgage-backed securities    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 43,571 81,417
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Level 2    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 43,571 81,417
Fair Value, Measurements, Recurring | Municipals    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 884 881
Fair Value, Measurements, Recurring | Municipals | Level 2    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 884 881
Fair Value, Measurements, Recurring | Government and government agencies - United States    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 254,469 362,119
Fair Value, Measurements, Recurring | Government and government agencies - United States | Level 1    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 254,469 362,119
Fair Value, Measurements, Recurring | Government and government agencies - Foreign    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 25,290 26,280
Fair Value, Measurements, Recurring | Government and government agencies - Foreign | Level 1    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 1,431 1,444
Fair Value, Measurements, Recurring | Government and government agencies - Foreign | Level 2    
Assets    
Fixed maturity AFS securities, at estimated fair value [1] 23,859 24,836
Fair Value, Measurements, Recurring | Redeemable preferred stock    
Assets    
Fixed maturity AFS securities, at estimated fair value 5,600 5,690 [1]
Fair Value, Measurements, Recurring | Redeemable preferred stock | Level 2    
Assets    
Fixed maturity AFS securities, at estimated fair value 5,600 5,690 [1]
Fair Value, Measurements, Recurring | Banking securities    
Assets    
Equity securities [1] 28,126  
Equity AFS securities [1]   28,497
Fair Value, Measurements, Recurring | Banking securities | Level 2    
Assets    
Equity securities [1] $ 28,126  
Equity AFS securities [1]   $ 28,497
[1] The fair values of debt securities are determined by management after taking into consideration several sources of data. When available, the Company uses quoted market prices in active markets to determine the fair value of its debt securities. The Company’s valuation policy utilizes a pricing hierarchy that dictates that publicly available prices are initially sought from indices and third-party pricing services. In the event that pricing is not available from these sources, securities are submitted to brokers to obtain quotes. The majority of brokers’ quotes are non-binding. As part of the pricing process, the Company assesses the appropriateness of each quote (i.e., whether the quote is based on observable market transactions) to determine the most appropriate estimate of fair value. Lastly, securities are priced using internal cash flow modeling techniques. These valuation methodologies commonly use the following inputs: reported trades, bids, offers, issuer spreads, benchmark yields, estimated prepayment speeds, and/or estimated cash flows. Third-party pricing services and brokers will often determine prices using recently reported trades for identical or similar securities. The third-party pricing services and brokers make adjustments for the elapsed time from the trade date to the Balance Sheet date to take into account available market information. Lacking recently reported trades, third-party pricing services and brokers will use modeling techniques to determine a security price where expected future cash flows are developed based on the performance of the underlying collateral and discounted using an estimated market rate. Periodically, the Company performs an analysis of the inputs obtained from third-party pricing services and brokers to ensure that the inputs are reasonable and produce a reasonable estimate of fair value. The Company’s asset specialists and investment valuation specialists consider both qualitative and quantitative factors as part of this analysis. Several examples of analytical procedures performed include, but are not limited to, recent transactional activity for similar debt securities, review of pricing statistics and trends and consideration of recent relevant market events. Other controls and procedures over pricing received from indices, third-party pricing services, or brokers include validation checks, such as exception reports that highlight significant price changes, stale prices or un-priced securities. Following is additional discussion of the valuation methodologies for certain types of debt and equity securities: Corporate debt securities - Valuations of corporate debt securities are monitored and reviewed on a monthly basis. The pricing hierarchy is dependent on the possibility of corroboration of market prices when available. If no market prices are available, valuations are determined by a discounted cash flow methodology using an internally calculated yield. The yield is comprised of a credit spread over a given benchmark, taking into account liquidity risk for thinly traded securities. Residential mortgage-backed securities (“RMBS”), commercial mortgage-backed securities (“CMBS”) and asset-backed securities (“ABS”) - Valuations of RMBS, CMBS and ABS are monitored and reviewed on a monthly basis. Valuations are based on a pricing hierarchy and, depending on the asset type, the pricing hierarchy consists of a waterfall that starts with making use of market prices from indices and follows with making use of third-party pricing services or brokers. The pricing hierarchy is dependent on the possibility of corroborating the market prices. If no market prices are available, the Company uses either internal models or another available pricing source to determine fair value. Significant inputs included in the internal models are generally determined based on relative value analyses, which incorporate comparisons to instruments with similar collateral and risk profiles. Market standard models may be used to model the specific collateral composition and cash flow structure of each transaction. The most significant unobservable input is the illiquidity premium, which is embedded in the discount rate. Government and government agencies - When available, the Company uses quoted market prices in active markets to determine the fair value of its government and government agencies’ investments. When the Company cannot make use of quoted market prices, it uses market prices from indices or quotes from third-party pricing services or brokers. Equity securities – Valuations of equity securities are monitored and reviewed on a monthly basis. When available, the Company uses quoted market prices in active markets to determine the fair value of its equity investments. When the Company cannot make use of quoted market prices, it uses quotes from a third-party vendor, broker, or custodian.
[2] Cash equivalents are primarily valued at amortized cost, which approximates fair value. Cash equivalents that receive a vendor price are classified as fair value Level 1. Operating cash is not included in the above table.
[3] Level 2 derivatives include interest rate swaps, inflation swaps, variance swaps, total return swaps, credit default swaps, and options for which the Company utilized readily accessible quoted index levels and broker quotes. The fair value of exchange traded interest rate swaps is calculated based on the change in the underlying floating rate curve measured using the Overnight Index Swap at the reporting date, as compared to the fixed leg of the swap. The fair value of over-the-counter (“OTC”) traded interest rate swaps is calculated based on the change in the underlying floating rate curve measured using the London Inter-Bank Offered Rate (“LIBOR”) at the reporting date, as compared to the fixed leg of the swap. The fair value of inflation swaps is calculated as the difference between the consumer price index (or related readily accessible quoted inflation index level) at the reporting date and the last reset date, multiplied by the notional value of the swap. The fair value of variance swaps is calculated as the difference between the estimated volatility of the underlying Standard & Poor’s 500 Composite Price Index (“S&P”) at maturity and the actual volatility of the underlying S&P at initiation (i.e., strike) multiplied by the notional value of the swap. Total return swaps are valued based on the change in the underlying equity index as of the last reset date. The fair value of equity options is calculated using the Black-Scholes model and market observable inputs for the underlying market price and volatility surface. Credit default swaps are valued using a discounted cash flow model where future premium payments and protection payments are corrected for the probability of default, which is modeled using an arbitrage free credit spread model.
[4] The Company reinsures a portion of its variable annuity business that offers GMIB reinsurance. GMIB reinsurance contracts are treated as embedded derivatives since they contain payment provisions for net settlement and, therefore, are reported separately from the host contract.
[5] Amounts are comprised of certain investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient and have not been classified in the fair value hierarchy in accordance with ASC 820-10. These investments do not have lockup periods.
[6] Amounts are comprised of certain investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient and have not been classified in the fair value hierarchy in accordance with ASC 820-10. These investments do not have lockup periods.
[7] The Company recognizes liabilities for contracts containing guaranteed minimum withdrawal benefits ("GMWB") and stand-alone living benefits ("SALB"), which are reported at fair value. The liabilities for the contracts containing GMWB are treated as embedded derivatives, which are required to be reported separately from the host contract. The fair value of these guarantees is calculated as the present value of future expected payments to policyholders less the present value of assessed fees attributable to the guarantees. Given the complexity and long-term nature of the guarantees, their fair values are determined using stochastic techniques under a variety of market return, discount rate and actuarial assumptions. Since two of the assumptions are unobservable and are considered to be significant inputs to the liability valuation, the liability included in future policy benefits has been reflected within Level 3 of the fair value hierarchy.