Pension, Profit Sharing, and Other Employee Benefit Plans (Net Periodic Benefit Cost) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension, Profit Sharing, and Other Employee Benefit Plans [Abstract]
Interest cost on projected benefit obligation	$ 406	$ 403	$ 1,223	$ 1,197
Expected return on plan assets	(405)	(493)	(1,217)	(1,480)
Recognized net actuarial loss	240	67	791	183
Net periodic benefit cost	$ 241	$ (23)	$ 797	$ (100)