Equity Incentive Plan - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended			6 Months Ended
	Jun. 18, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Stock Awards	Jun. 30, 2013 Stock Awards	Jun. 30, 2013 Stock Awards Minimum	Jun. 30, 2013 Stock Awards Minimum	Jun. 30, 2013 Stock Awards Maximum	Jun. 30, 2013 Stock Awards Maximum	Jun. 30, 2013 Restricted Stock Units (RSUs)	Mar. 31, 2013 Restricted Stock Units (RSUs)	Jun. 30, 2013 Stock Options and Restricted Stock	Jun. 30, 2013 Stock Options and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense		$ 365,367	$ 312,563	$ 788,326	$ 633,073
Increase in shares reserved for grant under stock option and incentive plan	650,000
Shares reserved for grant under stock option and incentive plan	3,800,000
Stock options granted to employees		20,000		374,500
Restricted stock units granted to Board of Directors												0	13,800
Stock option and incentive plan, vesting period								1 year	1 year	4 years	4 years			4 years	4 years
Unrecognized stock-based compensation cost		3,000,000		3,000,000
Unrecognized stock-based compensation cost, weighted-average recognition period				2 years 10 months 24 days
Intrinsic value of stock options and SARs				599,010	1,241,759
Cash received from exercise of stock options		30,859	32,377	1,127,875	147,033
Options and SARs outstanding		1,900,000		1,900,000
Weighted average exercise price per share		$ 8.60		$ 8.60
Intrinsic value of Options and SARs		$ 16,200,000		$ 16,200,000
Weighted average remaining contractual term		6 years 3 months 7 days		6 years 3 months 7 days
Stock based awards, contractual term						10 years	10 years