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Business Segment, Geographic and Quarterly Financial Data - Reporting Segment Net Sales and Gross Margin (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues from external customers $ 109,338 $ 97,644 $ 93,668
Cost of sales (62,521) (56,899) (49,857)
Gross margin 46,817 40,745 43,811
Selling, general and administrative (36,375) (32,682) (33,446)
Gain from revaluation of ACT liability     758
Research and development (2,442) (2,863) (1,474)
Operating income 8,000 5,200 9,649
Air Pollution Control Segment
      
Revenues from external customers 72,552 62,441 50,930
Cost of sales (45,138) (40,146) (28,467)
Gross margin 27,414 22,295 22,463
Selling, general and administrative 0 0 0
Gain from revaluation of ACT liability     0
Research and development 0 0 0
Operating income 27,414 22,295 22,463
FUEL CHEM Segment
      
Revenues from external customers 36,786 35,203 42,738
Cost of sales (17,383) (16,753) (21,390)
Gross margin 19,403 18,450 21,348
Selling, general and administrative 0 0 0
Gain from revaluation of ACT liability     0
Research and development 0 0 0
Operating income 19,403 18,450 21,348
Other
      
Revenues from external customers 0 0 0
Cost of sales 0 0 0
Gross margin 0 0 0
Selling, general and administrative (36,375) (32,682) (33,446)
Gain from revaluation of ACT liability     758
Research and development (2,442) (2,863) (1,474)
Operating income $ (38,817) $ (35,545) $ (34,162)