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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Reserve for uncollectible accounts	$ 6,700	$ 6,000
State tax net operating losses, valuation allowance	49
Hosting Arrangements [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in other assets due to capitalization of software implementation cost	7,100
Early Adoption ASU 2018-15 [Member] | Hosting Arrangements [Member]
Summary Of Significant Accounting Policies [Line Items]
Capitalized implementation costs of software services	10,600
State [Member]
Summary Of Significant Accounting Policies [Line Items]
Incentive tax credit carryforwards	$ 3,100
Transportation Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated life	15 years
Software Development [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets estimated useful life	10 years
Leasehold Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated life, description	The shorter of useful life or lease term.
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage	50.00%
Minimum [Member] | Hosting Arrangements [Member]
Summary Of Significant Accounting Policies [Line Items]
Capitalized implementation costs period	3 years
Maximum [Member] | Hosting Arrangements [Member]
Summary Of Significant Accounting Policies [Line Items]
Capitalized implementation costs period	10 years
Maximum [Member] | Customer Concentration Risk [Member] | Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Minimum percentage of revenue accounted for by one customer	10.00%	10.00%	10.00%
Maximum [Member] | Building And Improvement [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated life	40 years
Maximum [Member] | Computer Equipment and Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated life	10 years
Maximum [Member] | Furniture and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated life	10 years

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