Executive Compensation Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Executive Compensation Plan Expense [Line Items]
Deferred executive compensation plan, grant date value of awards		$ 1,100,000	$ 1,600,000
Deferred executive compensation plan, net expense	963,000	2,810,000	1,719,000
Deferred executive compensation plan,estimated future expense for unvested awards year one	$ 74,000