Equity Compensation Plans - Stock Options Granted and Exercised (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares subject to stock options granted	156,500	156,500	159,500
Weighted average grant date fair value	$ 9.27	$ 31.36	$ 28.90
Shares subject to stock options exercised	0	202,820	118,410
Intrinsic value of stock options exercised	$ 0	$ 4,802	$ 3,095
Proceeds received from stock options exercised	0	8,345	5,599
Tax benefits realized from stock options exercised	$ 0	$ 1,602	$ 1,190