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Debt Obligations-Other (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Feb. 22, 2016
USD ($)
Mar. 31, 2016
USD ($)
item
Mar. 31, 2015
USD ($)
item
Dec. 31, 2015
USD ($)
Feb. 21, 2016
USD ($)
Long-Term Debt Obligations          
Line of credit borrowing capacity accordion option $ 100,000        
Reconciliation of Earnings before Interest Tax Depreciation and Amortization to Net Income          
Net income including noncontrolling interests   $ 9,755 $ 6,889 $ 57,440  
Income taxes-continuing operations   $ (5,497) $ (3,793)    
Principal financial covenants          
Leverage ratio   3.00      
Other disclosures          
Current portion of capital lease obligations   $ 241   $ 251  
Number of acquisitions | item   2      
Shoffner          
Other disclosures          
Debt acquired related to coil line duct processing system   $ 400      
Outstanding balance   400      
Current debt   $ 100      
Other Acquisitions          
Other disclosures          
Number of acquisitions | item     2    
London Interbank Offered Rate (LIBOR) | Shoffner          
Market rates relating to interest options          
Interest rate margin (as a percent)   2.25%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   2.25%      
Revolving credit facility          
Long-Term Debt Obligations          
Borrowing capacity $ 325,000       $ 250,000
Letters of credit amount outstanding   $ 41,500      
Credit available   $ 232,500      
Principal financial covenants          
Leverage ratio   0.40      
Number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for calculation of fixed charge coverage ratio | item   4      
Fixed charge coverage ratio   30.40      
Number of interest rate options | item   2      
Other disclosures          
Weighted average interest rate (as a percent)   1.70%      
Revolving credit facility | Through maturity          
Principal financial covenants          
Leverage ratio   2.75      
Revolving credit facility | Minimum          
Additional per annum interest margin added under:          
Letter of credit fees (as a percent)   1.25%      
Commitment fees payable on unused portion of the facility (as a percent)   0.20%      
Revolving credit facility | Maximum          
Principal financial covenants          
Amount of stock repurchases to maintain maximum net leverage ratio   $ 25,000      
Net leverage ratio after giving effect to stock repurchases for calculation of the fixed charge coverage ratio   1.50      
Permitted amount of acquisitions per transaction   $ 30,000      
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction   $ 65,000      
Additional per annum interest margin added under:          
Letter of credit fees (as a percent)   2.00%      
Commitment fees payable on unused portion of the facility (as a percent)   0.35%      
Revolving credit facility | Base rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75          
Market rates relating to interest options          
Interest rate margin (as a percent)   0.25%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   0.25%      
Revolving credit facility | Base rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50          
Market rates relating to interest options          
Interest rate margin (as a percent)   0.50%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   0.50%      
Revolving credit facility | Base rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25          
Market rates relating to interest options          
Interest rate margin (as a percent)   0.75%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   0.75%      
Revolving credit facility | Base rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater          
Market rates relating to interest options          
Interest rate margin (as a percent)   1.00%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   1.00%      
Revolving credit facility | Eurodollar rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75          
Market rates relating to interest options          
Interest rate margin (as a percent)   1.25%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   1.25%      
Revolving credit facility | Eurodollar rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50          
Market rates relating to interest options          
Interest rate margin (as a percent)   1.50%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   1.50%      
Revolving credit facility | Eurodollar rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25          
Market rates relating to interest options          
Interest rate margin (as a percent)   1.75%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   1.75%      
Revolving credit facility | Eurodollar rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater          
Market rates relating to interest options          
Interest rate margin (as a percent)   2.00%      
Additional per annum interest margin added under:          
Additional per annum interest margin (as a percent)   2.00%      
Notes to former owners          
Other disclosures          
Outstanding balance   $ 2,800      
Notes to former owners | Shoffner          
Long-Term Debt Obligations          
Outstanding borrowings   $ 1,800      
Other disclosures          
Weighted average interest rate (as a percent)   3.00%      
Notes to former owners | Other Acquisitions          
Long-Term Debt Obligations          
Outstanding borrowings   $ 1,000      
Other disclosures          
Weighted average interest rate (as a percent)   2.50%      
Other debt | Dyna Ten          
Other disclosures          
Capital lease obligation pertaining to acquisition   $ 400      
Current portion of capital lease obligations   $ 200