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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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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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