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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income $ 41,140 $ 38,436 $ 26,517
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization of property and equipment 28,285 23,571 16,975
Amortization of intangibles 26,857 11,259 6,264
Amortization of deferred financing costs and debt discount 1,093 383 264
Provision for doubtful accounts 2,834 2,928 919
Write-off of debt issuance costs 2,113 286  
Gain on sale of property and equipment (492) (254) (409)
Gain on bargain purchase     (1,116)
Noncash stock compensation 6,592 1,894 2,116
Deferred income taxes (6,160) (605) (1,515)
Changes in assets and liabilities, excluding effects of acquisitions      
Accounts receivable (19,955) (18,760) (17,526)
Inventories (3,667) (8,677) (2,846)
Other assets (4,602) 2,803 823
Accounts payable 6,303 12,400 (2,511)
Income taxes payable/receivable (18,605) 1,484 3,592
Other liabilities 7,036 6,118 3,000
Net cash provided by operating activities 68,772 73,266 34,547
Cash flows from investing activities      
Purchases of investments (30,194)    
Purchases of property and equipment (31,668) (27,013) (27,305)
Acquisitions of businesses, net of cash acquired of $247, $2,181 and $926 in 2017, 2016 and 2015, respectively (137,120) (53,312) (84,274)
Proceeds from sale of property and equipment 959 691 634
Other (2,420) 37 (420)
Net cash used in investing activities (200,443) (79,597) (111,365)
Cash flows from financing activities      
Proceeds from revolving line of credit under credit agreement applicable to respective period (Note 6)   37,975 149,350
Payments on revolving line of credit under credit agreement applicable to respective period (Note 6)   (37,975) (149,350)
Proceeds from term loan under credit agreement applicable to respective period (Note 6) 300,000 100,000 50,000
Payments on term loan under credit agreement applicable to respective period (Note 6) (97,750) (51,875) (24,688)
Proceeds from delayed draw term loan under credit agreement applicable to respective period (Note 6) 112,500 12,500 50,000
Payments on delayed draw term loan under credit agreement applicable to respective period (Note 6) (125,000) (50,000)  
Proceeds from vehicle and equipment notes payable 22,460 22,948 21,334
Debt issuance costs (8,281) (1,238) (758)
Principal payments on long-term debt (10,002) (5,849) (4,088)
Principal payments on capital lease obligations (7,314) (8,598) (9,674)
Acquisition-related obligations (4,464) (3,057) (3,151)
Repurchase of common stock     (6,100)
Surrender of common stock awards by employees (562) (836)  
Purchase of remaining interest in subsidiary (1,888)    
Net cash provided by financing activities 179,699 13,995 72,875
Net change in cash and cash equivalents 48,028 7,664 (3,943)
Cash and cash equivalents at beginning of year 14,482 6,818 10,761
Cash and cash equivalents at end of year 62,510 14,482 6,818
Supplemental disclosures of cash flow information Net cash paid during the year for:      
Interest 13,758 5,342 3,287
Income taxes, net of refunds 38,887 18,929 13,493
Supplemental disclosure of noncash investing and financing activities      
Common stock issued for acquisition of business 10,859    
Vehicles capitalized under capital leases and related lease obligations 4,440 3,737 3,379
Seller obligations in connection with acquisition of businesses 5,128 4,459 13,180
Unpaid purchases of property and equipment included in accounts payable $ 2,003 $ 775 $ 220