Stock-Based Employee Compensation - Restricted Stock Units Granted (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		9 Months Ended
	Jan. 31, 2013	Sep. 30, 2013	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] February 2010 [Member]	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] February 2011 [Member]	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] February 2012 [Member]	Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] January 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs			33,518	33,044	40,393	45,316
Fair Value per Share	$ 7.55		$ 3.15	$ 4.11	$ 6.60	$ 7.55
Fair Value of Grant			$ 106	$ 136	$ 266	$ 342
Total		152,271
Fair Value of Grant Total		$ 850
Number Vested		25,020	16,759	8,261
Number Non-Vested		127,251	16,759	24,783	40,393	45,316