Retirement Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employer contribution	6.00%
Employee contribution	80.00%
Plan expense	$ 2,600,000	$ 2,600,000	$ 2,500,000
Retirement Plan expense	0	0	86,000
Minimum [Member]
Total annual compensation for a calendar year for non-qualified deferred compensation plan	$ 110,000
Eligibility of participants	1.00%
Maximum [Member]
Eligibility of participants	25.00%