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Long-Term Debt Obligations (Details 2)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
May. 01, 2014
USD ($)
Reconciliation of Earnings before Interest Tax Depreciation and Amortization to Net Income          
Goodwill impairment $ 727   $ 727    
Additional per annum interest margin added under:          
Payments of debt $ 2,000   $ 2,000    
Other disclosures          
Current portion of capital lease obligations   $ 287   $ 317  
Revolving credit facility          
Long-Term Debt Obligations          
Borrowing capacity   250,000      
Outstanding borrowings   18,000      
Letters of credit amount outstanding   48,000      
Credit available   $ 184,000      
Principal financial covenants          
Leverage ratio   0.23      
Number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for calculation of fixed charge coverage ratio | item   4      
Number of interest rate options | item   2      
Other disclosures          
Weighted average interest rate (as a percent)   1.40%      
Revolving credit facility | Environmental Air Systems, LLC          
Long-Term Debt Obligations          
Borrowing capacity   $ 2,500      
Credit available   $ 2,500      
Other disclosures          
Weighted average interest rate (as a percent)   2.00%      
Revolving credit facility | Actual          
Principal financial covenants          
Fixed charge coverage ratio   24.05      
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 | Minimum | Covenant Requirement          
Principal financial covenants          
Net leverage ratio used as basis for other restrictions   2.00      
Revolving credit facility | Minimum | Actual          
Principal financial covenants          
Fixed charge coverage ratio   2.00      
Revolving credit facility | Maximum          
Principal financial covenants          
Permitted amount of acquisitions per transaction   $ 25,000      
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction   $ 60,000      
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 | Maximum | Through maturity          
Principal financial covenants          
Leverage ratio   2.75      
Revolving credit facility | Maximum | Covenant Requirement          
Principal financial covenants          
Net leverage ratio used to determine exclusion of stock repurchases and the payment of dividends for calculation of the fixed charge coverage ratio   1.50      
Revolving credit facility | Maximum | Actual          
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      
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          
Long-Term Debt Obligations          
Outstanding balance   $ 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 in northern Texas   $ 700     $ 700
Current portion of capital lease obligations   $ 300