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Schedule of Commercial Mortgage Loan Portfolio by Geographical Region (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value $ 1,115,167us-gaap_LoansReceivableCommercialMortgage
General allowance for loan loss 0us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Total commercial mortgage loans 1,115,167us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
ALABAMA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 1,720us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_AL
ARIZONA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 35,481us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_AZ
CALIFORNIA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 255,563us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_CA
COLORADO  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 22,381us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_CO
FLORIDA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 20,779us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_FL
GEORGIA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 27,502us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_GA
HAWAII  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 8,125us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_HI
ILLINOIS  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 53,174us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_IL
IOWA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 1,490us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_IA
KENTUCKY  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 8,260us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_KY
MAINE  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 4,114us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_ME
MARYLAND  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 35,536us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_MD
MASSACHUSETTS  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 92,963us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_MA
MINNESOTA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 52,496us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_MN
MISSOURI  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 9,324us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_MO
NEVADA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 14,705us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_NV
NEW JERSEY  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 84,007us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_NJ
NEW YORK  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 72,625us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_NY
NORTH CAROLINA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 31,111us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_NC
OHIO  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 38,400us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_OH
OKLAHOMA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 10,835us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_OK
PENNSYLVANIA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 37,688us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_PA
SOUTH CAROLINA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 3,130us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_SC
TENNESSEE  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 5,719us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_TN
TEXAS  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 103,778us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_TX
UTAH  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 45,914us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_UT
VIRGINIA  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 18,572us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_VA
Washington  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 13,138us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_WA
WISCONSIN  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value $ 6,637us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_StatementGeographicalAxis
= stpr_WI