Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014 Scenario, Forecast [Member]	Dec. 31, 2013 Supplemental Pension Plans, Additional Retirement Benefits [Member]	Dec. 31, 2012 Supplemental Pension Plans, Additional Retirement Benefits [Member]	Dec. 31, 2011 Supplemental Pension Plans, Additional Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution of Pension Plan	5.00%	5.00%
Pension costs charged to operating expenses	$ 914	$ 1,219	$ 1,265
Matching percent of employee contribution annually	25.00%
Employee contribution as a percent of base salary	4.00%
Saving Plan cost charged to expenses	176	180	168
Total supplemental pension plans					1,944	1,586	1,397
Accumulated benefit obligation	13,704	13,360
Estimated net loss				752
Prior service cost		$ (216)	$ (449)	$ 0