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Hierarchy of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets    
Fixed maturity available-for-sale securities, at estimated fair value $ 1,463,444 $ 1,487,037
Equity available-for-sale securities 33,205 32,551
Derivative assets 2,609 16,526
Fair value recoverable of ceded GMIB embedded derivatives 39,244 48,166
Investments measured at NAV 5,796,266 5,730,860
Liabilities    
Derivative liabilities 7,051 15,165
Corporate securities    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 892,795 911,851
Asset-backed securities    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 49,386 52,587
Commercial mortgage-backed securities    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 74,572 76,513
Residential mortgage-backed securities    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 68,444 96,177
Municipals    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 871 856
Government and government agencies - United States    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 351,680 341,379
Government and government agencies - Foreign    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 25,696 7,674
Banking securities    
Assets    
Equity available-for-sale securities 27,405 26,726
Industrial securities    
Assets    
Equity available-for-sale securities 5,800 5,825
Fair Value, Measurements, Recurring    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 1,463,444 1,487,037
Equity available-for-sale securities [1] 33,205 32,551
Cash equivalents [2] 106,058 265,538
Derivative assets [3] 2,609 16,526
Fair value recoverable of ceded GMIB embedded derivatives [4] 39,244 48,166
Investments measured at NAV [5] 5,796,266 5,730,860
Total assets 7,440,826 7,580,678
Liabilities    
Future policy benefits (embedded derivatives only) [6] 48,395 55,143
Derivative liabilities [3] 7,051 15,165
Total liabilities 55,446 70,308
Fair Value, Measurements, Recurring | Level 1    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 352,955 342,859
Total assets 352,955 342,859
Fair Value, Measurements, Recurring | Level 2    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 1,097,201 1,134,963
Equity available-for-sale securities [1] 33,205 32,551
Cash equivalents [2] 106,058 265,538
Derivative assets [3] 2,609 16,526
Total assets 1,239,073 1,449,578
Liabilities    
Derivative liabilities [3] 7,051 15,165
Total liabilities 7,051 15,165
Fair Value, Measurements, Recurring | Level 3    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 13,288 9,215
Fair value recoverable of ceded GMIB embedded derivatives [4] 39,244 48,166
Total assets 52,532 57,381
Liabilities    
Future policy benefits (embedded derivatives only) [6] 48,395 55,143
Total liabilities 48,395 55,143
Fair Value, Measurements, Recurring | Corporate securities    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 892,795 911,851 [1]
Fair Value, Measurements, Recurring | Corporate securities | Level 2    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value 892,795 911,851 [1]
Fair Value, Measurements, Recurring | Asset-backed securities    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 49,386 52,587
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 36,098 43,372
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 13,288 9,215
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 74,572 76,513
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Level 2    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 74,572 76,513
Fair Value, Measurements, Recurring | Residential mortgage-backed securities    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 68,444 96,177
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Level 2    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 68,444 96,177
Fair Value, Measurements, Recurring | Municipals    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 871 856
Fair Value, Measurements, Recurring | Municipals | Level 2    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 871 856
Fair Value, Measurements, Recurring | Government and government agencies - United States    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 351,680 341,379
Fair Value, Measurements, Recurring | Government and government agencies - United States | Level 1    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 351,481 341,379
Fair Value, Measurements, Recurring | Government and government agencies - United States | Level 2    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 199  
Fair Value, Measurements, Recurring | Government and government agencies - Foreign    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 25,696 7,674
Fair Value, Measurements, Recurring | Government and government agencies - Foreign | Level 1    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 1,474 1,480
Fair Value, Measurements, Recurring | Government and government agencies - Foreign | Level 2    
Assets    
Fixed maturity available-for-sale securities, at estimated fair value [1] 24,222 6,194
Fair Value, Measurements, Recurring | Banking securities    
Assets    
Equity available-for-sale securities [1] 27,405 26,726
Fair Value, Measurements, Recurring | Banking securities | Level 2    
Assets    
Equity available-for-sale securities [1] 27,405 26,726
Fair Value, Measurements, Recurring | Industrial securities    
Assets    
Equity available-for-sale securities [1] 5,800 5,825
Fair Value, Measurements, Recurring | Industrial securities | Level 2    
Assets    
Equity available-for-sale securities [1] $ 5,800 $ 5,825
[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, those 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., as to whether the quote is based on observable market transactions or not) 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 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 effect 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, market prices from indices or quotes from third-party pricing services or brokers are used. 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, quotes from a third-party vendor, broker, or custodian are used.
[2] Cash equivalents are primarily valued at amortized cost, which approximates fair value. Operating cash is not included in the above table.
[3] Level 2 derivatives include interest rate swaps, inflation swaps, variance swaps, total return swaps, and credit default swaps for which the Company utilized readily accessible quoted index levels and broker quotes. The fair value of 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 for 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 for 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 for 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 offer GMIB reinsurance. GMIB reinsurance contracts are treated as embedded derivatives since they contain payment provisions for net settlement and are therefore 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 Subtopic 820-10. These investments do not have lockup periods.
[6] 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.