Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Status of Stock Options Related to Stock Plans (Detail)

v3.6.0.2
Employee Benefit Plans - Status of Stock Options Related to Stock Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options Outstanding Beginning Balance 714,000    
Options Outstanding Exercised (15,000)    
Options Outstanding Forfeited (260,000)    
Options Outstanding Ending Balance 439,000 714,000  
Options Outstanding Exercisable 439,000    
Weighted Average Exercise Price Per Share, Beginning Balance $ 17.56    
Weighted Average Exercise Price Per Share, Exercised 1.81    
Weighted Average Exercise Price Per Share, Forfeited 25.44    
Weighted Average Exercise Price Per Share, Ending Balance 13.42 $ 17.56  
Weighted Average Exercise Price Per Share, Exercisable $ 13.42    
Weighted Average Remaining Contractual Term 1 year 4 months 24 days 1 year 7 months 6 days  
Weighted Average Remaining Contractual Term, Exercisable 1 year 4 months 24 days    
Aggregate Intrinsic Value, Beginning Balance $ 5,327 $ 5,605  
Aggregate Intrinsic Value, Exercisable 5,327    
Intrinsic value of stock options exercised $ 250 $ 2,511 $ 1,187
Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Exercise Price Per Share, Beginning Balance $ 1.81    
Exercise Price Per Share, Exercised 1.81    
Exercise Price Per Share, Forfeited 23.30    
Exercise Price Per Share, Ending Balance 1.81 $ 1.81  
Exercise Price Per Share, Exercisable 1.81    
Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Exercise Price Per Share, Beginning Balance 30.07    
Exercise Price Per Share, Exercised 1.81    
Exercise Price Per Share, Forfeited 26.42    
Exercise Price Per Share, Ending Balance 30.07 $ 30.07  
Exercise Price Per Share, Exercisable $ 30.07