Quarterly report pursuant to Section 13 or 15(d)

Compensation (Narrative) (Detail)

v3.4.0.3
Compensation (Narrative) (Detail)
3 Months Ended 15 Months Ended
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock based compensation $ 859,000 $ 1,654,000  
Stock options granted, exercisable life 5 years    
Stock, vesting period 3 years    
Cash proceeds from exercise of stock options   $ 445,000  
Stock options remainder vesting period     2 years
Shares repurchased | shares 31,808    
Stock Appreciation Rights (SARs) [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
egy-Share-based Compensation Arrangement By Share-based Payment Award, Life 5 years    
egy-Share-based Compensation Arrangemet By Share Based Payment Award, Spread 300   300
egy-Share-based Compensation Arrangement by Share-based Payment Award, Grant Date Share Price $ 1.04    
Stock, vesting period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 815,355    
Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock, vesting period 5 years