Summary of Significant Accounting Policies - Company's Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2017	[1]	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Product and related sales										$ 136,016		$ 101,344		$ 75,154
RefrigerantSide ® Services										4,364		4,137		4,568
Total	$ 24,613		$ 24,706	$ 52,231	$ 38,830	$ 7,779	$ 34,930	$ 34,605	$ 28,167	$ 140,380	[2]	$ 105,481	[2]	$ 79,722

[1] As discussed previously, the fourth quarter 2017 results include the results of ARI subsequent to the acquisition on October 10, 2017.

[2] The sum of the net earnings per share may not add up to the full year amount due to rounding and because the quarterly calculations are based on varying numbers of shares outstanding.