Subsequent Events (Details) - Subsequent Event [Member] - USD ($) $ in Thousands	May. 03, 2016	Apr. 27, 2016
Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Subsequent Event Description	On May 3, 2016, we entered into a Second Amendment (the “Amendment”) to the Amended and Restated Credit and Security Agreement (as amended, the “Amended Credit Agreement”).
Maximum Revolver Amount	$ 70,000
Credit Facility Expiration Date	Aug. 09, 2019
Credit Facility Interest Rate Description	Prior to the Amendment, the interest rate on the facility was equal to a Daily Three Month LIBOR (as defined in the Amended Credit Agreement), plus an interest rate margin of between 2.00 and 3.00 percent. The Amendment reduced this interest rate margin to a range from 1.75 to 2.25 percent, with a 3.25 percent interest rate margin on overadvance amounts outstanding under the facility.
Credit Facility Covenant Terms	the requirement that the Company maintain a Fixed Charge Coverage Ratio (as defined in the Amended Credit Agreement) of not less than 1.0:1.0 at any time that Liquidity (defined as the aggregate amount of unrestricted cash and cash equivalents on hand plus Excess Availability) falls below $14 million, with at least $7 million of Excess Availability.
Business Acquisition STR [Member]
Subsequent Event [Line Items]
Subsequent Event Description		On April 27, 2016, a wholly-owned subsidiary of our Commercial & Industrial segment acquired an 80% interest in STR Mechanical, LLC (“STR”),
Name of Acquired Business		STR Mechanical, LLC (“STR”)
Description of Acquired Business		a Charlotte, North Carolina-based provider of commercial and industrial mechanical services, including maintenance, repair, and replacement services, and temperature control system installations.