Employer Sponsored Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Components of net periodic benefit cost
Interest cost	$ 509	$ 614	$ 1,840	$ 1,841
Expected return on assets	(605)	(673)	(2,192)	(2,019)
Amortization of actuarial loss	182	267	542	801
Pension settlement charge	4,870	0	4,870	0
Net periodic benefit cost	$ 4,956	$ 208	$ 5,060	$ 623