Equity-Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		1 Months Ended		9 Months Ended
	Feb. 13, 2011	Sep. 30, 2012	Sep. 30, 2012 Stock Options	Sep. 30, 2011 Stock Options	Sep. 30, 2012 Stock Options	Sep. 30, 2011 Stock Options	Sep. 30, 2012 Restricted shares awards	Sep. 30, 2012 Restricted shares awards	Sep. 30, 2012 2011 Equity Incentive Plan	Jun. 07, 2012 2011 Equity Incentive Plan Director	Apr. 25, 2012 2011 Equity Incentive Plan Executive officers	Sep. 30, 2012 2011 Equity Incentive Plan Stock Options Minimum	Sep. 30, 2012 2011 Equity Incentive Plan Stock Options Maximum	Sep. 30, 2012 Equity Incentive Plan	Sep. 30, 2012 Equity Incentive Plan Director	Sep. 30, 2012 Equity Incentive Plan Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares provides for grants									2,318,290
Term of option												5 years	10 years
Options granted	940,000									15,288				940,000	4,000
Exercise price of options granted														$ 9.75
Vesting period of options																5 years
Equity-based compensation		$ 783,253	$ 125,874	$ 51,201	$ 377,622	$ 314,685	$ 142,810	$ 285,620		$ 120,011				$ 39,000
Unrecognized compensation costs related to non-vested awards			2,500,000		2,500,000
Share based compensation non-vested awards period of recognition		2 years 6 months			4 years 10 months 24 days
Restricted shares awarded		192,739									192,739
Unrecognized compensation costs related to non-vested awards		$ 1,300,000