Annual report pursuant to Section 13 and 15(d)

Deferred Compensation Plan (Detail)

v2.4.1.9
Deferred Compensation Plan (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Plans Disclosure [Abstract]    
Minimum period of participation before distributions are made 5 years  
Cash surrender value due policyholders, amount $ 10,419us-gaap_CashSurrenderValueDuePolicyholdersAmount $ 12,370us-gaap_CashSurrenderValueDuePolicyholdersAmount
Deferred compensation liability $ 17,640us-gaap_DeferredCompensationLiabilityCurrent $ 19,056us-gaap_DeferredCompensationLiabilityCurrent