Segment Information - PP&E and Total Assets by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Depreciation, depletion and amortization of PP&E:
Total depreciation, depletion and amortization of PP&E	$ 28,310	$ 20,681	$ 18,762
Additions to PP&E:
Total additions to PP&E	166,419	150,805	47,957
Total assets at December 31:
Total assets	1,083,097	576,612	502,009
Chemical [Member]
Depreciation, depletion and amortization of PP&E:
Total depreciation, depletion and amortization of PP&E	23,497	16,355	14,659
Additions to PP&E:
Total additions to PP&E	160,343	141,399	39,835
Total assets at December 31:
Total assets	842,725	394,479	294,886
Climate Control [Member]
Depreciation, depletion and amortization of PP&E:
Total depreciation, depletion and amortization of PP&E	4,707	4,250	3,853
Additions to PP&E:
Total additions to PP&E	5,576	5,816	5,746
Total assets at December 31:
Total assets	159,960	139,526	160,515
Other [Member]
Depreciation, depletion and amortization of PP&E:
Total depreciation, depletion and amortization of PP&E	49	32	107
Additions to PP&E:
Total additions to PP&E	65	889	54
Total assets at December 31:
Total assets	6,832	8,204	7,857
Corporate assets [Member]
Depreciation, depletion and amortization of PP&E:
Total depreciation, depletion and amortization of PP&E	57	44	143
Additions to PP&E:
Total additions to PP&E	435	2,701	2,322
Total assets at December 31:
Total assets	$ 73,580	$ 34,403	$ 38,751