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Segment Information - Segment Financial Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 149,035 | $ 177,350 | $ 202,223 | $ 150,679 | $ 177,137 | $ 182,374 | $ 209,275 | $ 190,245 | $ 679,287 | $ 759,031 | $ 805,256
Gross profit | 30,566 | 48,909 | 38,659 | 25,422 | 40,370 | 33,187 | 65,735 | 44,444 | 143,556 | 183,736 | 223,018
Operating income |  |  |  |  |  |  |  |  | 105,308 | 95,655 | 136,443
Interest expense, net |  |  |  |  |  |  |  |  | 13,986 | 4,237 | 6,658
Losses on extinguishment of debt |  |  |  |  |  |  |  |  | 1,296 |  | 136
Non-operating expense (income), net |  |  |  |  |  |  |  |  | 100 | 281 |
Provisions for income taxes |  |  |  |  |  |  |  |  | 35,421 | 33,594 | 46,208
Equity in earnings of affiliate-Climate Control |  |  |  |  |  |  |  |  | (436) | (681) | (543)
Income from continuing operations | 37,473 | 10,250 | 7,486 | (68) | 11,622 | 6,710 | 26,130 | 14,324 | 55,141 | 58,786 | 83,984
Chemical [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 380,669 | 477,813 | 511,854
Gross profit |  |  |  |  |  |  |  |  | 46,165 | 97,692 | 130,687
Operating income |  |  |  |  |  |  |  |  | 87,784 | 82,101 | 116,503
Non-operating expense (income), net |  |  |  |  |  |  |  |  | (1) | (1) | (1)
Chemical [Member] | Agricultural products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 167,614 | 217,329 | 231,599
Chemical [Member] | Industrial acids and other chemical products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 141,936 | 162,498 | 161,776
Chemical [Member] | Mining products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 63,042 | 96,538 | 118,479
Chemical [Member] | Natural gas [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,077 | 1,448 |
Climate Control [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 285,018 | 266,171 | 281,565
Gross profit |  |  |  |  |  |  |  |  | 92,907 | 80,981 | 88,178
Operating income |  |  |  |  |  |  |  |  | 30,386 | 25,834 | 32,759
Non-operating expense (income), net |  |  |  |  |  |  |  |  | (1) | (1) | (2)
Climate Control [Member] | Geothermal and water source heat pumps [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 183,757 | 162,697 | 183,789
Climate Control [Member] | Hydronic fan coils [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 64,541 | 55,812 | 54,379
Climate Control [Member] | Other HVAC products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 36,720 | 47,662 | 43,397
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 13,600 | 15,047 | 11,837
Gross profit |  |  |  |  |  |  |  |  | 4,484 | 5,063 | 4,153
Operating income |  |  |  |  |  |  |  |  | 1,699 | 2,091 | 1,584
Non-operating expense (income), net |  |  |  |  |  |  |  |  | (98) | (279) | 3
General corporate expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | $ (14,561) | $ (14,371) | $ (14,403)

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