Pension, Profit Sharing, and Other Employee Benefit Plans (Components of Net Unrecognized Benefits Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension, Profit Sharing, and Other Employee Benefit Plans [Abstract]
Included in accumulated other comprehensive income (loss), Beginning Balance	$ 14,774	$ 5,539	$ 14,879
Additions during the year	1,955	977	(3,969)
Reclassifications due to recognition as net periodic pension cost	(1,032)	(251)	(1,255)
Increase (decrease) related to change in discount rate assumption	(2,659)	8,509	(4,099)
Excess if distributions over reduction in projected benefit obligations			254
Loss recognized due to settlement			(271)
Included in accumulated other comprehensive income (loss), Ending Balance	13,038	$ 14,774	$ 5,539
Applicable tax effect	(5,175)
Included in accumulated other comprehensive income (loss) net of tax effect at December 31, 2014	7,863
Amount expected to be recognized as part of net periodic pension cost in the next fiscal year	$ 1,135