Acquisitions - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Oct. 10, 2017	Jan. 16, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 30, 2016	Jun. 22, 2012
Business Acquisition Purchase Price Allocation Description		The purchase price for this acquisition was $2.4 million cash paid at closing, the assumption of a liability of $20,000, and a maximum additional $3.0 million earn-out.
Tangible assets	$ 24,179,000	$ 1,600,000
Intangible assets		1,600,000
Goodwill		2,300,000	$ 48,600,000
Business Combination, Consideration Transferred, Total	209,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					$ 3,000,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability					1,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total	208,969,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill					1,900,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles					800,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory					100,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount		2,300,000	48,600,000
ProForma PreTax Losses			14,800,000
Business Acquisition, Pro Forma Revenue			255,701,000	$ 239,626,000
PNC Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity	150,000,000		80,000,000
Proceeds from Lines of Credit	$ 80,000,000		105,000,000
Minimum [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total					4,400,000
Line of Credit Facility, Maximum Borrowing Capacity							$ 40,000,000
Maximum [Member]
Allocated Share Based Compensation Expense			3,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total					$ 5,400,000
Line of Credit Facility, Maximum Borrowing Capacity						$ 50,000,000
Polar Technologies [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total		$ 2,400,000
Airgas Refrigerants, Inc. [Member]
Business Acquisition, Pro Forma Revenue			1,500,000
Business Combination, Acquisition Related Costs			$ 6,300,000