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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items] |  |  |
Reporting business segments | Segment | 2 |  |
Reserve for uncollectible accounts | $ 8.5 | $ 5.4 |
State tax net operating losses, valuation allowance | 0.1 |  |
Accounting Standards Update 2014-09 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Impact on consolidated financial statements due to adoption of topic 606 | 3.0 | $ 3.0 |
State [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Incentive tax credit carryforwards | $ 1.6 |  |
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% |  |
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 |  |
Maximum [Member] | Transportation Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment estimated life | 15 years |  |
Maximum [Member] | Software Development [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets estimated useful life | 10 years |  |

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