Stock-Based Employee Compensation - Stock Granted to Our Non-employee Directors (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended	1 Months Ended				9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Jul. 31, 2013 Director [Member]	Jan. 31, 2013 Director [Member]	Jul. 31, 2012 Director [Member]	Feb. 29, 2012 Director [Member]	Sep. 30, 2013 Director [Member]	Sep. 30, 2012 Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares	0	0	16,587	29,205	16,328	31,820	45,792	48,148
Fair Value per Share			$ 8.44	$ 7.55	$ 8.36	$ 6.60
Fair Value of Grant			$ 140	$ 221	$ 136	$ 210	$ 361	$ 346