Pension and Profit Sharing Plans - Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Service cost-benefits earned during the period	$ 0	$ 0	$ 0
Interest cost on projected benefit obligation	523	635	665
Expected return on plan assets	(1,028)	(974)	(912)
Amortization of unrecognized net loss	186	249	375
Recognized loss on partial settlement of certain participant balances	1,546		267
Net periodic pension benefit expense (benefit)	$ 1,227	$ (90)	$ 395