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Segment Information - PP&E and Total Assets by Business Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | $ 40,496 | $ 35,664 | $ 28,310
Additions to PP&E: |  |  |
Total additions to PP&E | 470,509 | 240,104 | 166,419
Total assets at December 31: |  |  |
Total assets | 1,361,827 | 1,130,572 | 1,075,218
Operating Segments [Member] | Chemical [Member] |  |  |
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | 35,239 | 30,364 | 23,497
Additions to PP&E: |  |  |
Total additions to PP&E | 469,558 | 238,070 | 160,343
Total assets at December 31: |  |  |
Total assets | 1,159,592 | 929,671 | 842,588
Operating Segments [Member] | Climate Control [Member] |  |  |
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | 4,834 | 4,946 | 4,707
Additions to PP&E: |  |  |
Total additions to PP&E | 632 | 1,859 | 5,576
Total assets at December 31: |  |  |
Total assets | 148,997 | 133,183 | 159,960
Operating Segments [Member] | Other [Member] |  |  |
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | 36 | 34 | 49
Additions to PP&E: |  |  |
Total additions to PP&E | 25 | 27 | 65
Total assets at December 31: |  |  |
Total assets | 5,502 | 5,960 | 6,832
Corporate [Member] | Corporate [Member] |  |  |
Depreciation, depletion and amortization of PP&E: |  |  |
Total depreciation, depletion and amortization of PP&E | 387 | 320 | 57
Additions to PP&E: |  |  |
Total additions to PP&E | 294 | 148 | 435
Total assets at December 31: |  |  |
Total assets | $ 47,736 | $ 61,758 | $ 65,838

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