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Segment Information - Segment Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 157,021 | $ 163,617 | $ 192,345 | $ 198,798 | $ 187,258 | $ 177,860 | $ 210,746 | $ 185,382 | $ 711,781 | $ 761,246 | $ 701,241
Gross profit | 19,070 | 11,180 | 32,697 | 40,761 | 30,054 | 22,942 | 47,445 | 47,433 | 103,708 | 147,874 | 138,119
Operating income (loss) |  |  |  |  |  |  |  |  | (50,752) | 53,362 | 105,308
Interest expense, net |  |  |  |  |  |  |  |  | 7,381 | 21,599 | 13,986
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 1,296
Non-operating expense (income), net |  |  |  |  |  |  |  |  | 124 | (281) | (100)
Provisions (benefit) for income taxes |  |  |  |  |  |  |  |  | (23,550) | 12,400 | 35,421
Equity in earnings of affiliate - Climate Control |  |  |  |  |  |  |  |  |  | (79) | (436)
Income (loss) from continuing operations | $ (8,047) | $ (33,759) | $ 420 | $ 6,679 | $ 718 | $ (3,772) | $ 11,134 | $ 11,643 | (34,707) | 19,723 | 55,141
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (29,917) | (21,365) | (14,561)
Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 428,129 | 483,638 | 402,623
Gross profit |  |  |  |  |  |  |  |  | 16,644 | 61,084 | 40,728
Non-operating expense (income), net |  |  |  |  |  |  |  |  | (363) | (249) | (1)
Chemical [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (41,831) | 51,281 | 87,784
Chemical [Member] | Agricultural Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 209,770 | 230,046 | 180,763
Chemical [Member] | Industrial Acids and Other Chemical Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 167,520 | 173,876 | 150,497
Chemical [Member] | Mining Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 47,475 | 67,484 | 63,286
Chemical [Member] | Other Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,364 | 12,232 | 8,077
Climate Control [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 274,086 | 265,358 | 285,018
Gross profit |  |  |  |  |  |  |  |  | 83,660 | 82,443 | 92,907
Non-operating expense (income), net |  |  |  |  |  |  |  |  | (4) |  | (1)
Equity in earnings of affiliate - Climate Control |  |  |  |  |  |  |  |  |  | (79) | (436)
Climate Control [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 19,892 | 21,675 | 30,386
Climate Control [Member] | Water Source and Geothermal Heat Pumps [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 156,314 | 168,804 | 183,757
Climate Control [Member] | Hydronic Fan Coils [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 68,082 | 61,307 | 64,541
Climate Control [Member] | Other HVAC Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 49,690 | 35,247 | 36,720
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,566 | 12,250 | 13,600
Gross profit |  |  |  |  |  |  |  |  | 3,404 | 4,347 | 4,484
Other [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 1,104 | 1,771 | 1,699
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-operating expense (income), net |  |  |  |  |  |  |  |  | $ 491 | $ (32) | $ (98)

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