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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Statement of Cash Flows [Abstract]    
Net cash provided by operating activities $ 14,693 $ 2,617
Cash flows from investing activities    
Restricted cash 70 95
Purchases of property and equipment (2,626) (2,072)
Acquisitions of businesses, net of cash acquired of $53 and $0, respectively (3,313) (687)
Proceeds from sale of property and equipment 518 1,113
Net cash used in investing activities (5,351) (1,551)
Cash flows from financing activities    
Proceeds from initial public offering of common stock, net of costs 87,645  
Proceeds from secondary public offering of common stock, net of costs 14,418  
Redemption of Redeemable Preferred Stock (75,735)  
(Payments) proceeds from revolving line of credit, net (27,269) 6,484
Proceeds from term loan 25,000  
Debt issuance costs (714)  
Principal payments on long term debt (719) (473)
Payments on capital lease obligations (6,921) (4,595)
Payments for deferred initial public offering costs (4,254) (1,110)
Payments for deferred secondary public offering costs (126)  
Net cash provided by financing activities 11,325 306
Net change in cash 20,667 1,372
Cash at beginning of period 4,065 3,898
Cash at end of period 24,732 5,270
Supplemental disclosures of cash flow information Net cash paid during the period for:    
Interest 1,883 1,522
Income taxes, net of refunds 4,726 6,200
Supplemental disclosure of noncash investing and financing activities    
Vehicles capitalized under capital leases and related lease obligations 13,581 15,374
Note payable issued in connection with acquisition of business 454 300
Unpaid deferred offering costs   $ 899