Executive Nonqualified Defined Benefit Plan - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Vesting period	6 years
Discount rate for benefit obligation and net periodic service cost	4.25%	3.25%	4.00%
Insurance policy value	$ 1,962	$ 1,466
Contribution to 401K plan	191	161	136
Initial Employee Contribution
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee contributions	50.00%
Percentage of employee compensation	2.00%
Chief Executive Officer
Defined Benefit Plan Disclosure [Line Items]
Annual retirement payment	300,000
W.E.T
Defined Benefit Plan Disclosure [Line Items]
Underfunded defined benefit plan	$ 3,679	$ 3,844