Share-Based Compensation - Option Activity under the Company's Stock Option Plans (Detail) - Jun. 30, 2015 - USD ($)	Total
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, Number of shares, Beginning balance	311,705
Issued, Number of shares	0
Exercised, Number of shares	(15,500)
Forfeited, Number of shares	(3,462)
Expired, Number of shares	0
Outstanding, Number of shares, Ending balance	292,743
Options exercisable, Number of shares, Ending balance	271,743
Outstanding, Weighted average exercise price, Beginning balance	$ 9.69
Issued, Weighted average exercise price	0
Exercised, Weighted average exercise price	7.30
Forfeited, Weighted average exercise price	12.28
Expired, Weighted average exercise price	0
Outstanding, Weighted average exercise price, Ending balance	9.78
Options exercisable, Weighted average exercise price, Ending balance	$ 9.80
Outstanding, Weighted average remaining contractual term (in years), Ending balance	3 years 9 months 4 days
Options exercisable, Weighted average remaining contractual term (in years), Ending balance	3 years 5 months 5 days
Outstanding, Aggregate intrinsic value, Beginning balance	$ 681,861
Outstanding, Aggregate intrinsic value, Ending balance	653,340
Options exercisable, Aggregate intrinsic value, Ending balance	$ 601,293