Stock Options and Restricted Stock - Weighted Average Grant Date Fair Values of Options Granted (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Cash received from option exercises	$ 2,344	$ 781	$ 3,339
Total tax benefits realized for tax deductions from options exercised	2,002	405	1,025
Total intrinsic value of options exercised	6,654	1,468	4,240
Grant date fair value of options vested	226	310	315
Aggregate intrinsic value of vested options outstanding	$ 17,467	$ 13,393	$ 11,288