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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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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