Annual report pursuant to Section 13 and 15(d)

Compensation (Narrative) (Detail)

v3.3.1.900
Compensation (Narrative) (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock options, authorized 4,557,185    
Stock based compensation $ 3,810,000 $ 3,322,000 $ 3,005,000
Tax benefits related to stock based compensation $ 0    
Stock options granted, exercisable life 5 years    
Cash proceeds from exercise of stock options $ 441,000 5,685,000 3,729,000
Total intrinsic value of options exercised $ 300,000 $ 4,100,000 $ 1,200,000
Weighted Average Grant Price, Awards granted $ 1.65 $ 2.43 $ 2.45
Other benefit plans, cost $ 444,000 $ 464,000 $ 182,500
Stock Option [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Cash proceeds from exercise of stock options 0 5,700,000 3,700,000
Unrecognized compensation costs $ 1,600,000    
Compensation costs expected to be recognized 10 months 21 days    
Restricted Stock [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock, vesting period 3 years    
Unrecognized compensation costs $ 1,200,000    
Compensation costs expected to be recognized 2 years 5 months 12 days    
Vested, grant date fair value $ 700,000 $ 400,000 $ 0
Weighted Average Grant Price, Awards granted $ 3.34 $ 6.98 $ 5.89
Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock, vesting period 5 years