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Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]                      
U. S. federal tax expense at statutory rate                 $ 8,379us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 16,189us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 13,760us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (reduction) in income taxes resulting from:                      
Small insurance company income exclusion                     (451)us-gaap_IncomeTaxReconciliationDeductionsExtraterritorialIncomeExclusion
State tax, net of federal benefit                 603us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,112us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,026us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other                 155us-gaap_IncomeTaxReconciliationOtherAdjustments 159us-gaap_IncomeTaxReconciliationOtherAdjustments 226us-gaap_IncomeTaxReconciliationOtherAdjustments
Total $ 2,285us-gaap_IncomeTaxExpenseBenefit $ 838us-gaap_IncomeTaxExpenseBenefit $ 2,649us-gaap_IncomeTaxExpenseBenefit $ 3,365us-gaap_IncomeTaxExpenseBenefit $ 5,130us-gaap_IncomeTaxExpenseBenefit $ 4,539us-gaap_IncomeTaxExpenseBenefit $ 3,793us-gaap_IncomeTaxExpenseBenefit $ 3,998us-gaap_IncomeTaxExpenseBenefit $ 9,137us-gaap_IncomeTaxExpenseBenefit $ 17,460us-gaap_IncomeTaxExpenseBenefit $ 14,561us-gaap_IncomeTaxExpenseBenefit