XML 97 R86.htm IDEA: XBRL DOCUMENT v3.8.0.1
Cash Value of Life Insurance - Additional Information (Detail)
3 Months Ended
Mar. 31, 2018
Policies
Company
Mar. 31, 2017
Company
Insurance [Abstract]    
Number of life insurance policies owned by the Company 182  
Insurance companies used | Company 14 14
Policies covering current and former employees and directors 57