Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Additional Information (Detail)

v3.4.0.3
Stock Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock option expense $ 46,000 $ 36,000
Amortization of non-vested stock grants and performance-based awards $ 1,866,000 $ 1,612,000
Stock options exercised by employees and directors 0 9,500
Number of shares of non-vested stock that vested 7,185 5,234