XML 139 R106.htm IDEA: XBRL DOCUMENT v3.7.0.1
Employee Benefit Plans - Unfunded Post Retirement Benefits Plan (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Sale Of Subsidiary [Abstract]      
Benefit obligation at beginning of year $ 3,066 $ 2,744 $ 2,485
Interest cost 108 90 102
Service cost 103 96 84
Actual claims (151) (109) (108)
Actuarial loss 283 245 181
Benefit obligation at end of year $ 3,409 $ 3,066 $ 2,744