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Employee Benefit Plans - Recognized Net Periodic Benefit Cost and Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Sale Of Subsidiary [Abstract]      
Service cost $ 103 $ 96 $ 84
Interest cost 108 90 102
Net amortization of transition obligation and actuarial loss 184 173 149
Net periodic benefit cost 395 359 335
Net loss 282 311 117
Plan amendment 0 0 0
Amortization of loss (184) (173) (149)
Amortization of transition obligation 0 0 0
Total recognized in other comprehensive income 98 138 (32)
Total recognized in net periodic benefit cost and other comprehensive income $ 493 $ 497 $ 303