Stockholders' Equity - Additional Awards Under 2011 LTIP (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended												39 Months Ended	12 Months Ended	19 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2013 Restricted Stock Units [Member] 2011 Long Term Incentive Plan [Member]	Dec. 31, 2013 Restricted Stock Units [Member] 2011 Long Term Incentive Plan [Member]
Shares
Beginning Balance, shares														232,966
Granted, shares	6,266	4,606	4,712	5,350	5,263	4,084	3,769	3,785	3,979	3,439	3,627	2,955	51,835	434,811
Vested, shares														0
Forfeited, shares														(50,750)	(152,044)
Ending Balance, shares														617,027	617,027
Weighted- Average Grant Date Fair Value
Beginning Balance														$ 11.20
Granted														$ 12.76
Vested														$ 0.00
Forfeited														$ 11.20
Ending Balance														$ 12.30	$ 12.30
Total Unrecognized Compensation Cost (net of estimated forfeitures)														$ 3,573	$ 3,573
Weighted-Average Period Over Which Cost is Expected to be Recognized														12 months