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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash Flows from Operating Activities:      
Net income (loss) $ 41,449,000 $ (4,578,000) $ 17,076,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 116,753,000 116,570,000 115,566,000
Amortization of deferred financing costs and discounts 5,170,000 5,437,000 6,641,000
Impairment of property and equipment 0 0 5,898,000
Change in fair value of private placement warrants 7,600,000 1,133,000 16,267,000
Tax receivable agreement liability adjustment (1,016,000) 6,850,000 (106,000)
Loss on extinguishment of debt 5,334,000    
Credit loss expense (income) 9,588,000 14,391,000 8,100,000
Deferred income taxes (10,640,000) (4,746,000) (10,894,000)
Stock-based compensation 13,784,000 12,589,000 10,012,000
Other 308,000 1,210,000 1,721,000
Changes in operating assets and liabilities:      
Accounts receivable, net (14,946,000) (90,592,000) (12,662,000)
Unbilled receivables (7,753,000) 5,964,000 (6,428,000)
Inventories 2,798,000    
Prepaid expenses and other assets (5,097,000) 3,829,000 (7,150,000)
Deferred revenue (3,966,000) 58,000 316,000
Accounts payable and other current liabilities 8,296,000 (16,925,000) (8,510,000)
Other liabilities (4,383,000) (4,281,000) (2,045,000)
Net cash provided by operating activities 193,171,000 46,909,000 133,802,000
Cash Flows from Investing Activities:      
Acquisitions, net of cash and restricted cash acquired (451,237,000)   (25,519,000)
Purchases of installation and service parts and property and equipment (24,998,000) (24,260,000) (29,685,000)
Cash proceeds from the sale of assets 265,000 107,000 231,000
Net cash used in investing activities (475,970,000) (24,153,000) (54,973,000)
Cash Flows from Financing Activities:      
Borrowings on revolver 25,000,000    
Borrowings of long-term debt 1,245,500,000    
Repayment of long-term debt (884,530,000) (28,779,000) (9,104,000)
Payment of debt issuance costs (10,646,000) (1,078,000) (426,000)
Payment of debt extinguishment costs (1,066,000)    
Share repurchase and retirement (100,000,000)    
Proceeds from exercise of stock options 155,000    
Payment of employee tax withholding related to RSUs vesting (5,691,000) (4,147,000) (4,990,000)
Net cash provided by (used in) financing activities 268,722,000 (34,004,000) (14,520,000)
Effect of exchange rate changes on cash and cash equivalents (2,383,000) (290,000) 1,040,000
Net (decrease) increase in cash, cash equivalents and restricted cash (16,460,000) (11,538,000) 65,349,000
Cash, cash equivalents and restricted cash - beginning of period 120,892,000 132,430,000 67,081,000
Cash, cash equivalents and restricted cash - end of period 104,432,000 120,892,000 132,430,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]      
Cash and cash equivalents 101,283,000 120,259,000 131,513,000
Restricted cash 3,149,000 633,000 917,000
Total cash, cash equivalents, and restricted cash 104,432,000 120,892,000 132,430,000
Supplemental cash flow information:      
Interest paid 35,786,000 35,822,000 55,197,000
Income taxes paid, net of refunds 35,774,000 12,638,000 24,357,000
Supplemental non-cash investing and financing activities:      
Earn-out shares issued to Platinum Stockholder   18,287,000 18,288,000
Additions related to asset retirement obligations, property and equipment, and other [1] 1,397,000 133,000 230,000
Purchases of installation and service parts and property and equipment in accounts payable and accrued liabilities at year-end 1,714,000 $ 1,289,000 4,204,000
Contingent consideration related to NuPark acquisition $ 1,450,000    
Tenant improvement allowance included in property and equipment     581,000
Gores equity infusion working capital adjustment payable to related party     7,001,000
Reduction to tax receivable agreement liability     $ 2,940,000
[1] Asset retirement obligations of $3.9 million assumed as part of the Redflex acquisition are excluded from these additions.