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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, 2016 USD ($) Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |
Reporting business segments | Segment | 2 |  |
Reserve for uncollectible accounts | $ 5.4 | $ 5.2 |
State tax net operating losses, valuation allowance | 0.1 |  |
State [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Incentive tax credit carryforwards | $ 0.4 |  |
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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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 + Details
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