Significant Accounting Policies and Practices - Additional Information (Details)		1 Months Ended	3 Months Ended								12 Months Ended				23 Months Ended
	Nov. 30, 2018 USD ($)	Oct. 31, 2014	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) voting_interest_model_entity variable_interest_entity partnership	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Jan. 03, 2018 USD ($)
Significant Accounting Policies [Line Items]
Consideration transferred											$ 277,900,000	$ 0	$ 0
Cash and cash equivalents restricted to withdrawals			$ 1,700,000				$ 300,000				1,700,000	300,000			$ 1,700,000
Allowance for doubtful accounts			1,000,000				700,000				1,000,000	700,000			1,000,000
Impairment loss as a result of goodwill											$ 0	0	0
Forecasted period for income statement and working capital projections to assess goodwill impairment											5 years
Debt issuance costs			2,200,000				1,000,000				$ 2,200,000	1,000,000			2,200,000
Accumulated amortization of debt issuance costs			10,400,000				9,700,000				10,400,000	9,700,000			10,400,000
Amortization expense											700,000	700,000	800,000
Book overdrafts			34,000,000				29,000,000				34,000,000	29,000,000			$ 34,000,000
Cost of services			$ 328,800,000	$ 317,100,000	$ 311,100,000	$ 327,400,000	$ 351,000,000	$ 346,800,000	$ 346,000,000	$ 361,400,000	1,284,400,000	1,405,200,000	1,392,000,000
Advertising expenses											1,500,000	1,500,000	1,200,000
Gain on sale of equity method Investee												8,500,000
Equity earnings in related investments											2,700,000	11,300,000	2,400,000
Cash received from sale of a business, net											$ 0	600,000	0
Discontinued Operations, Disposed of by Sale | Parkmobile
Significant Accounting Policies [Line Items]
Sale price of business																	$ 19,000,000
Gain on sale of business						$ 10,100,000
Discontinued Operations, Disposed of by Sale | Security Business
Significant Accounting Policies [Line Items]
Sale price of business														$ 1,800,000
Gain on sale of business														500,000
Cash received from sale of a business, net														$ 1,000,000
Period of cash consideration to be received														18 months
Period to calculate and remit remaining consideration															60 days
Contingent consideration receivable from sale of business												600,000	500,000	$ 500,000
Additional earn out consideration												100,000
Minimum
Significant Accounting Policies [Line Items]
Voting interest ownership percentage			30.00%								30.00%				30.00%
Maximum
Significant Accounting Policies [Line Items]
Voting interest ownership percentage			50.00%								50.00%				50.00%
Equipment | Minimum
Significant Accounting Policies [Line Items]
Ranges of estimated useful life											1 year
Equipment | Maximum
Significant Accounting Policies [Line Items]
Ranges of estimated useful life											10 years
Leasehold improvements | Maximum
Significant Accounting Policies [Line Items]
Ranges of estimated useful life											10 years
Leasehold improvements | Average
Significant Accounting Policies [Line Items]
Ranges of estimated useful life											4 years 6 months
Partnerships and joint ventures
Significant Accounting Policies [Line Items]
Number of ownership interest entities | partnership											30
Bags
Significant Accounting Policies [Line Items]
Consideration transferred	$ 277,900,000
Cash acquired from acquisition	$ 5,900,000
Central Merger
Significant Accounting Policies [Line Items]
Cost of property repairs and maintenance											$ 0	$ 100,000	$ 700,000
Variable Interest Entity, Primary Beneficiary
Significant Accounting Policies [Line Items]
Number of ownership interest entities | variable_interest_entity											25
Variable Interest Entity, Not Primary Beneficiary
Significant Accounting Policies [Line Items]
Number of ownership interest entities | voting_interest_model_entity											5
Accounting Standards Update 2018-02
Significant Accounting Policies [Line Items]
Reclassification of stranded tax effects from AOCI to retained earnings											$ 600,000
Parkmobile, LLC
Significant Accounting Policies [Line Items]
Ownership percentage		30.00%
Forecast | Accounting Standards Update 2016-02 | Minimum
Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset																$ 475,000,000
Operating lease, liability																490,000,000
Forecast | Accounting Standards Update 2016-02 | Maximum
Significant Accounting Policies [Line Items]
Operating lease, right-of-use asset																505,000,000
Operating lease, liability																$ 520,000,000