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Significant Accounting Policies - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 | Jan. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Amount insured by FDIC |  |  |  | $ 250,000 |  |
Cash equivalents |  |  |  | 69,800,000 | $ 55,600,000 |
Impairment of long-lived assets |  |  |  | 0 | 0 | $ 0
Insurance cost of claims |  |  |  | 15,242,000 | 14,620,000 |
Advertising expenses |  |  |  | 3,800,000 | 3,200,000 | 3,000,000
Amortization expense related to financing costs |  |  |  | 1,200,000 | 1,100,000 | 400,000
Deferred financing costs |  |  |  | 6,400,000 | 6,800,000 |
Write-off of debt issuance costs, included in interest expense |  |  |  | $ 1,164,000 | $ 2,113,000 | $ 286,000
Federal corporate tax rate |  |  |  | 21.00% | 35.00% | 35.00%
Tax benefit recognized, due to tax rate change |  |  |  | $ 800,000 | $ 3,800,000 |
Cumulative effect, net of tax |  |  |  | 2,142,000 |  |
Accounting Standards Update 2017-12 [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Adjustment to retained earnings and accumulated other comprehensive income to reclassify cash flow hedge |  | $ 100,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Cumulative effect, net of tax |  | $ 2,100,000 | $ (800,000) |  |  |
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Result of ASU implementation | $ 43,000,000 |  |  |  |  |
Other Non-Current Assets [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Retainage receivables, expected to be collected |  |  |  | $ 600,000 |  |
Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 6 years |  |
Minimum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 4 years |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 15 years |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 8 years |  |
Covenants Not-to-Compete [Member] | Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |
Covenants Not-to-Compete [Member] | Minimum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 1 year |  |
Trademarks and Trade Names [Member] | Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 15 years |  |
Trademarks and Trade Names [Member] | Minimum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 2 years |  |
Vehicles [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life, description |  |  |  | The shorter of lease life or five years |  |
Furniture, Fixtures and Equipment[Member] | Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |
Furniture, Fixtures and Equipment[Member] | Minimum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 3 years |  |
Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |
Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 3 years |  |
Leasehold Improvements [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life, description |  |  |  | The shorter of lease life or five years |  |
Building [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Estimated useful life |  |  |  | 30 years |  |
Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Customer concentration risk, percentage |  |  |  | 100.00% | 100.00% | 100.00%
Revenue [Member] | Customer Concentration Risk [Member] | Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Customer concentration risk, percentage |  |  |  | 4.00% | 4.00% | 4.00%
Accounts Receivable [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Retainage receivables |  |  |  | $ 28,000,000 | $ 23,100,000 |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Customer concentration risk, percentage |  |  |  | 3.00% | 3.00% | 3.00%
Workers' Compensation Insurance [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Insurance cost of claims |  |  |  | $ 800,000 | $ 800,000 |
General Liability Insurance Program [Member] | Maximum [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Insurance cost of claims |  |  |  | 2,000,000 | 2,000,000 |
Aggregate cap of insurance cost of claims |  |  |  | 8,000,000 | 8,000,000 |
Vehicles Insurance [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Insurance cost of claims |  |  |  | 500,000 | 500,000 |
Senior Secured Credit Agreement [Member] |  |  |  |  |  |
Accounting Policies and General Information [Line Items] |  |  |  |  |  |
Deferred financing costs |  |  |  | 1,100,000 | 1,000,000 |
Write-off of debt issuance costs, included in interest expense |  |  |  | $ 100,000 | $ 2,100,000 |

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