NV5 Global (NVEE) 10-Q 7 Nov 19 2019 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 28, 2019	Nov. 06, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 28, 2019
Document Transition Report	false
Entity File Number	001-35849
Entity Registrant Name	NV5 Global, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-3458017
Entity Address, Address Line One	200 South Park Road,
Entity Address, Address Line Two	Suite 350
Entity Address, Postal Zip Code	33021
Entity Address, City or Town	Hollywood,
Entity Address, State or Province	FL
City Area Code	954
Local Phone Number	495-2112
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	NVEE
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		12,818,872
Entity Central Index Key	0001532961
Current Fiscal Year End Date	--12-28
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Current assets:
Cash and cash equivalents	$ 31,425	$ 40,739
Billed receivables, net	109,590	98,324
Unbilled receivables, net	53,818	43,411
Prepaid expenses and other current assets	9,198	2,582
Total current assets		185,056
Property and equipment, net	12,349	11,677
Right-of-use lease asset, net	42,366
Intangible assets, net	100,688	99,756
Goodwill	158,423	140,930
Other assets	2,886	2,002
Total Assets		439,421
Current liabilities:
Accounts payable	23,082	22,588
Accrued liabilities	33,654	20,853
Income taxes payable	0	2,697
Billings in excess of costs and estimated earnings on uncompleted contracts	2,241	7,625
Client deposits	276	208
Current portion of contingent consideration	3,351	1,845
Current portion of notes payable and other obligations	17,578	17,139
Total current liabilities	80,182	72,955
Contingent consideration, less current portion	2,195	2,853
Long-term lease liability	32,781
Notes payable and other obligations, less current portion	40,638	29,847
Deferred income tax liabilities, net	16,881	16,224
Total liabilities		121,879
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.01 par value; 45,000,000 shares authorized, 12,818,919 and 12,550,711 shares issued and outstanding as of September 28, 2019 and December 29, 2018, respectively	128	126
Additional paid-in capital	246,869	236,525
Retained earnings	101,070	80,891
Total stockholders’ equity	$ 348,067	317,542
Total liabilities and stockholders’ equity		$ 439,421

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares	Sep. 28, 2019	Dec. 29, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	45,000,000	45,000,000
Common stock, shares issued (in shares)	12,818,919	12,550,711
Common stock, shares outstanding (in shares)	12,818,919	12,550,711

Consolidated Statements of Net

Consolidated Statements of Net Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Lessee, Lease, Description [Line Items]
Gross revenues	$ 131,032	$ 104,185	$ 376,340	$ 302,737
Direct costs (excluding depreciation and amortization):
Salaries and wages	40,426	34,475	113,762	98,542
Sub-consultant services	19,972	14,989	56,969	43,349
Other direct costs	7,139	4,747	25,244	13,539
Total direct costs	67,536	54,211	195,975	155,430
Gross Profit	63,496	49,974	180,365	147,307
Operating Expenses:
Salaries and wages, payroll taxes and benefits	33,428	24,897	93,431	76,122
General and administrative	11,028	7,556	30,786	23,348
Facilities and facilities related		3,490		10,552
Depreciation and amortization	6,551	4,057	18,908	11,660
Total operating expenses	55,671	40,000	155,533	121,682
Income from operations	7,825	9,974	24,832	25,625
Interest expense	(421)	(451)	(1,230)	(1,712)
Income before income tax expense	7,403	9,523	23,602	23,913
Income tax expense	(1,560)	(2,238)	(3,422)	(4,716)
Net Income and Comprehensive Income	$ 5,843	$ 7,285	$ 20,180	$ 19,197
Earnings per share:
Basic (USD per Share)	$ 0.48	$ 0.65	$ 1.67	$ 1.80
Diluted (USD per Share)	$ 0.46	$ 0.62	$ 1.62	$ 1.71
Weighted average common shares outstanding:
Basic (in shares)	12,191,405	11,256,946	12,086,588	10,686,040
Diluted (in shares)	12,566,966	11,701,394	12,485,049	11,205,748
Facilities and facilities related
Operating Expenses:
Facilities and facilities related	$ 4,664		$ 12,407

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Cash Flows From Operating Activities:
Net income	$ 20,180	$ 19,197
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,908	11,660
Non-cash lease expense	6,770
Provision for doubtful accounts	1,725	843
Stock based compensation	6,989	4,541
Change in fair value of contingent consideration	49	267
Gain on disposals of property and equipment	(48)	0
Deferred income taxes	(3,839)	564
Changes in operating assets and liabilities, net of impact of acquisitions:
Billed receivables	508	(6,396)
Unbilled receivables	(4,490)	(3,759)
Prepaid expenses and other assets	(5,279)	819
Accounts payable	(2,053)	(679)
Accrued liabilities	(9,170)	(3,259)
Income taxes payable	(2,789)	(6,713)
Billings in excess of costs and estimated earnings on uncompleted contracts	(5,972)	485
Deposits	68	0
Net cash provided by operating activities	21,557	17,570
Cash Flows From Investing Activities:
Cash paid for acquisitions (net of cash received from acquisitions)	(29,365)	(28,460)
Purchase of property and equipment	(1,810)	(1,582)
Net cash used in investing activities	(31,175)	(30,042)
Cash Flows From Financing Activities:
Proceeds from secondary offering	0	93,469
Borrowings from Senior Credit Facility	10,000	0
Payments on notes payable	(8,483)	(7,410)
Payments of contingent consideration	(1,213)	(728)
Proceeds from exercise of unit warrant	0	1,092
Payments of borrowings from Senior Credit Facility	0	(36,500)
Net cash provided by financing activities	304	49,923
Net (decrease) increase in Cash and Cash Equivalents	(9,314)	37,451
Cash and cash equivalents – beginning of period	40,739	18,751
Cash and cash equivalents – end of period	31,425	56,202
Non-cash investing and financing activities:
Contingent consideration (earn-out)	2,570	1,565
Notes payable and other obligations issued for acquisitions	10,044	8,356
Stock issuance for acquisitions	2,632	4,950
Capital leases	$ 769	$ 2,878

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings
Beginning Balance (in shares) at Dec. 30, 2017		10,834,770
Beginning Balance at Dec. 30, 2017	$ 180,097	$ 108	$ 125,954	$ 54,035
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	4,541		4,541
Restricted stock issuance, net (in shares)		144,118
Restricted stock issuance, net		$ 2	(2)
Stock issuance for acquisitions (in shares)		73,012
Stock issuance for acquisitions	4,950	$ 1	4,949
Proceeds from secondary offering, net of costs (in shares)		1,270,000
Proceeds from secondary offering, net of costs	93,469	$ 13	93,456
Proceeds from exercise of warrants, net of costs (in shares)		140,000
Proceeds from exercise of warrants, net of costs	1,092	$ 1	1,091
Net income	19,197			19,197
Ending Balance (in shares) at Sep. 29, 2018		12,461,900
Ending Balance at Sep. 29, 2018	303,346	$ 125	229,989	73,232
Beginning Balance (in shares) at Jun. 30, 2018		11,129,082
Beginning Balance at Jun. 30, 2018	197,804	$ 111	131,746	65,947
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	1,902		1,902
Restricted stock issuance, net (in shares)		25,672
Restricted stock issuance, net		$ 0	(1)
Stock issuance for acquisitions (in shares)		37,146
Stock issuance for acquisitions	2,886	$ 0	2,886
Proceeds from secondary offering, net of costs (in shares)		1,270,000
Proceeds from secondary offering, net of costs	93,469	$ 13	93,456
Net income	7,285			7,285
Ending Balance (in shares) at Sep. 29, 2018		12,461,900
Ending Balance at Sep. 29, 2018	303,346	$ 125	229,989	73,232
Beginning Balance (in shares) at Dec. 29, 2018		12,550,711
Beginning Balance at Dec. 29, 2018	317,542	$ 126	236,525	80,891
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	6,989		6,989
Restricted stock issuance, net (in shares)		215,431
Restricted stock issuance, net		$ 2	(2)
Stock issuance for acquisitions (in shares)		41,592
Stock issuance for acquisitions	2,632	$ 0	2,632
Net income	$ 20,180			20,180
Payment of contingent consideration with common stock (in shares)	11,185
Payment of contingent consideration with common stock	$ 725	$ 0	725
Ending Balance (in shares) at Sep. 28, 2019		12,818,919
Ending Balance at Sep. 28, 2019	348,067	$ 128	246,869	101,070
Beginning Balance (in shares) at Jun. 29, 2019		12,657,841
Beginning Balance at Jun. 29, 2019	339,001	$ 127	243,646	95,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation	2,819		2,819
Restricted stock issuance, net (in shares)		155,307
Restricted stock issuance, net	1	$ 1	0
Stock issuance for acquisitions (in shares)		5,771
Stock issuance for acquisitions	403	$ 0	403
Net income	5,843			5,843
Ending Balance (in shares) at Sep. 28, 2019		12,818,919
Ending Balance at Sep. 28, 2019	$ 348,067	$ 128	$ 246,869	$ 101,070

Organization and Nature of Busi

Organization and Nature of Business Operations	9 Months Ended
	Sep. 28, 2019
Accounting Policies [Abstract]
Organization and Nature of Business Operations	Organization and Nature of Business Operations Business NV5 Global, Inc. and its subsidiaries (collectively, the “Company,” “NV5 Global,” “our,” “we”) is a provider of professional and technical engineering and consulting solutions to public and private sector clients in the infrastructure, energy, construction, real estate and environmental markets, operating nationwide and abroad. The Company’s clients include the U.S. federal, state and local governments, and the private sector. NV5 Global provides a wide range of services, including, but not limited to: ● Infrastructure, engineering and support ● Management oversight ● Construction quality assurance, testing and inspection ● Permitting ● Program management ● Inspection and field supervision ● Energy ● Testing inspection and certification ● Environmental ● Forensic engineering ● Planning ● Litigation support ● Design ● Condition assessment ● Consulting ● Compliance certification

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 28, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation The consolidated financial statements of the Company are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for reporting of interim financial information. Pursuant to such rules and regulations, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Certain amounts in the consolidated financial statements and associated notes may not add due to rounding. All percentages have been calculated using unrounded amounts. In the opinion of management, the accompanying unaudited interim consolidated financial statements of the Company contain all adjustments necessary to present fairly the financial position and results of operations of the Company as of the dates and for the periods presented. Accordingly, these statements should be read in conjunction with the consolidated financial statements and notes contained in the Company’s Annual Report on Form 10-K for the year ended December 29, 2018 (the “2018 Form 10-K”). The results of operations and cash flows for the interim periods presented are not necessarily indicative of the results to be expected for any future interim period or for the full 2019 fiscal year. Goodwill and Intangible Assets Goodwill is the excess of consideration paid for an acquired entity over the amounts assigned to assets acquired, including other identifiable intangible assets and liabilities assumed in a business combination. To determine the amount of goodwill resulting from a business combination, the Company performs an assessment to determine the acquisition date fair value of the acquired company’s tangible and identifiable intangible assets and liabilities. Goodwill is required to be evaluated for impairment on an annual basis or whenever events or changes in circumstances indicate the asset may be impaired. An entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. These qualitative factors include: macroeconomic and industry conditions, cost factors, overall financial performance and other relevant entity-specific events. If the entity determines that this threshold is met, then performing the two-step quantitative impairment test is unnecessary. The two-step impairment test requires a comparison of the carrying value of the assets and liabilities associated with a reporting unit, including goodwill, with the fair value of the reporting unit. The Company determines fair value through multiple valuation techniques, and weights the results accordingly. NV5 Global is required to make certain subjective and complex judgments in assessing whether an event of impairment of goodwill has occurred, including assumptions and estimates used to determine the fair value of its reporting units. If the carrying value of a reporting unit exceeds the fair value of the reporting unit, the Company would calculate the implied fair value of its reporting unit goodwill as compared to the carrying value of its reporting unit goodwill to determine the appropriate impairment charge, if any. The Company has elected to perform its annual goodwill impairment review on August 1 of each year. The Company conducts its annual impairment tests on the goodwill using the quantitative method of evaluating goodwill. Identifiable intangible assets primarily include customer backlog, customer relationships, trade names and non-compete agreements. Amortizable intangible assets are amortized on a straight-line basis over their estimated useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the assets may be impaired. If an indicator of impairment exists, the Company compares the estimated future cash flows of the asset, on an undiscounted basis, to the carrying value of the asset. If the undiscounted cash flows exceed the carrying value, no impairment is indicated. If the undiscounted cash flows do not exceed the carrying value, then impairment, if any, is measured as the difference between fair value and carrying value, with fair value typically based on a discounted cash flow model. On August 1, 2019, the Company conducted its annual impairment tests using the quantitative method of evaluating goodwill. Based on the quantitative analyses the Company determined the fair value of each of the reporting units exceeded its carrying value. Therefore, the goodwill was not impaired and the Company did not recognize an impairment charge relating to goodwill as of August 1, 2019. Furthermore, there were no indicators, events or changes in circumstances that would indicate goodwill was impaired during the period from August 2, 2019 through September 28, 2019. See Note 8 for further information on goodwill and identified intangibles. There have been no significant changes, other than those related to the adopted new accounting standards below, in the Company’s accounting policies from those disclosed in our 2018 Form 10-K. Adoption of New Accounting Standards Leases We adopted ASU No. 2016-2, Leases ("Topic 842"), as of the first day of the fiscal year 2019 using the modified retrospective approach and elected not to adjust comparative periods. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification and the initial direct costs. We elected the practical expedient to keep leases with an initial term of 12 months or less off the balance sheet and the practical expedient to account for non-lease components in a contract as part of a single lease component. Lease payments are recognized in the Consolidated Statements of Operations on a straight-line basis over the lease term. Adoption of the new standard resulted in the recording of additional right-of-use lease assets and lease liabilities of $34,186 and $34,965 , respectively, as of the first day of the fiscal year 2019. The standard did not materially impact our consolidated net earnings and had no impact on cash flows. Additionally, there was no cumulative effect of adoption on retained earnings in the Statement of Changes in Stockholders' Equity. Revenue Recognition On the first day of fiscal year 2018, we adopted ASC Topic 606, Revenue from Contracts with Customers (“Topic 606”), using the modified retrospective approach to all contracts that were not completed as of the beginning of fiscal year 2018. We utilize the portfolio method practical expedient, which allows companies to account for multiple contracts as a portfolio, instead of accounting for them on a contract by contract basis (commonly known as the contract method). For our time and materials contracts, we apply the as-invoiced practical expedient, which permits us to recognize revenue as the right to invoice for services performed. The new standard did not materially affect our consolidated net income, financial position, or cash flows. Performance Obligations Some of our contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and therefore, is not distinct. However, in some instances, we may also promise to provide distinct goods or services within a contract, resulting in multiple performance obligations. For contracts with multiple performance obligations, we allocate the contract transaction price to each performance obligation using the best estimate of the standalone selling price of each distinct good or service in the contract. Typically, we sell a customer a specific service and use the expected cost plus a margin approach to estimate the standalone selling price of each performance obligation. The Company’s performance obligations are satisfied as work progresses or at a point in time. Revenue on our cost-reimbursable contracts is recognized over time using direct costs incurred or direct costs incurred to date as compared to the estimated total direct costs for performance obligations because it best depicts the transfer of control to the customer. Contract costs include labor, subcontractors’ costs and other direct costs. Gross revenue from services transferred to customers at a point in time is recognized when the customer obtains control of the asset, which is generally upon delivery and acceptance by the customer of the reports and/or analysis performed. As of September 28, 2019, we had $504,349 of remaining performance obligations, of which $390,454 is expected to be recognized over the next 12 months and the majority of the balance over the next 24 months. Contracts for which work authorizations have been received are included in performance obligations. Most of our government contracts are multi-year contracts for which funding is appropriated on an annual basis, therefore performance obligations includes only those amounts that have been funded and authorized and does not reflect the full amounts we may receive over the term of such contracts. In the case of non-government contracts and project awards, performance obligations includes future revenue at contract or customary rates, excluding contract renewals or extensions that are at the discretion of the client. For contracts with a not-to-exceed maximum amount, we include revenue from such contracts in performance obligations to the extent of the remaining estimated amount. Contract Assets and Liabilities The timing of revenue recognition, billings and cash collections results in billed receivables, unbilled receivables (contract assets), and billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities) on the Consolidated Balance Sheet. The liability “Billings in excess of costs and estimated earnings on uncompleted contracts” represents billings in excess of revenues recognized on these contracts as of the reporting date. This liability is generally classified as current. Revenue recognized that was included in the contract liability balance at the beginning of the fiscal year was $2 and $6,437 for the three and nine months ended September 28, 2019, respectively and $222 and $ 434 for the three and nine months ended September 29, 2018 , respectively.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 28, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 28, 2019
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the Company. The effect of potentially dilutive securities is not considered during periods of loss or if the effect is anti-dilutive. The weighted average number of shares outstanding in calculating basic earnings per share for the nine months ended September 28, 2019 and September 29, 2018 exclude 625,687 and 588,430 non-vested restricted shares, respectively. There were no potentially anti-dilutive securities during the three and nine months ended September 28, 2019 and September 29, 2018 . The following table represents a reconciliation of the net income and weighted average shares outstanding for the calculation of basic and diluted earnings per share: Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, Numerator: Net income – basic and diluted $ 5,843 $ 7,285 $ 20,180 $ 19,197 Denominator: Basic weighted average shares outstanding 12,191,405 11,256,946 12,086,588 10,686,040 Effect of dilutive non-vested restricted shares and units 308,240 381,250 325,219 396,577 Effect of issuable shares related to acquisitions 67,321 63,198 73,242 88,594 Effect of warrants — — — 34,537 Diluted weighted average shares outstanding 12,566,966 11,701,394 12,485,049 11,205,748 Warrant exercise In conjunction with our initial public offering on March 26, 2013, the underwriter received a warrant to acquire up to 140,000 units (“Unit Warrant”). On March 23, 2016, the underwriter paid us $1,008 to exercise the Unit Warrant. Each of the units delivered upon exercise consisted of one share of our common stock and one warrant to purchase one share of our common stock at an exercise price of $7.80 per share (“Warrant”), which warrant expired on March 27, 2018. On March 19, 2018, the underwriter paid us $1,092 to exercise the Warrant. On March 21, 2018, we delivered 140,000 shares of common stock to the underwriter.

Business Acquisitions

Business Acquisitions	9 Months Ended
	Sep. 28, 2019
Business Combinations [Abstract]
Business Acquisitions	Business Acquisitions 2019 Acquisitions On July 2, 2019, the Company acquired WHPacific, Inc. (“WHPacific”), a leading provider of design engineering and surveying services serving Washington, Oregon, Idaho, New Mexico, Arizona and California for a cash purchase price of $9,000 . In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for WHPacific, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. The Company expects to finalize the purchase price allocation with respect to this transaction by the end of the fourth quarter 2019. On July 1, 2019, the Company acquired GeoDesign, Inc. (“GeoDesign”), a geotechnical, environmental, geological, mining and pavement engineering company with serving Washington, Oregon and California. The aggregate purchase price is up to $12,800 , including $8,500 of cash, $ 2,000 in promissory note (bearing interest at 4% ), payable in four equal installments of $500 due on the first, second, third and fourth anniversaries of July 1, 2019 and $375 of the Company’s common stock ( 4,731 shares) issued at the closing date. The purchase price also includes $425 of the Company’s common stock payable on the first and second anniversary of July 1, 2019. Further, the purchase price includes a $1,500 earn-out of cash, which was recorded at an estimated fair value of $1,456 . In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for GeoDesign, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. The Company expects to finalize the purchase price allocation with respect to this transaction by the end of the fourth quarter 2019. On June 3, 2019, the Company acquired Alta Environmental, L.P. (“Alta”), a consulting firm specializing in air quality, environmental building sciences, water resources, site assessment and remediation as well as environmental health and safety compliance services. The aggregate purchase price is up to $6,500 , including $4,000 of cash and $ 2,000 in promissory note (bearing interest at 4% ), payable in four equal installments of $500 due on the first, second, third and fourth anniversaries of June 3, 2019. Further, the purchase price includes a $500 earn-out of cash, which was recorded at an estimated fair value of $485 . In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for Alta, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. The Company expects to finalize the purchase price allocation with respect to this transaction by the end of the fourth quarter 2019. On June 3, 2019, the Company acquired Page One Consultants (“Page One”), a program management and construction quality assurance firm based in Orlando, Florida. The aggregate purchase price is up to $3,900 , including $2,000 of cash, $1,000 in promissory note (bearing interest at 3% ), payable in three equal installments of $333 due on the first, second and third anniversaries of June 3, 2019 and $200 of the Company’s common stock ( 2,647 shares) issued at the closing date. The purchase price also includes $200 of the Company’s common stock payable on the first anniversary of June 3, 2019. Further, the purchase price includes a $500 earn-out of cash and stock, which was recorded at an estimated fair value of $448 . In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for Page One, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. The Company expects to finalize the purchase price allocation with respect to this transaction by the end of the fourth quarter 2019. On March 22, 2019, the Company acquired The Sextant Group, Inc. (“The Sextant Group”), a national leading provider of audiovisual, information and communications technology, acoustics consulting, and design services headquartered in Pittsburgh, PA. The Sextant Group provides services throughout the U.S. and is well-known for creating integrated technology solutions for a wide range of public and private sector clients. The aggregate purchase price is up to $11,000 , including $7,000 of cash and $4,000 in promissory note (bearing interest at 4% ), payable in four equal installments of $1,000 due on the first, second, third and fourth anniversaries of March 22, 2019. In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for The Sextant Group, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. The Company expects to finalize the purchase price allocation with respect to this transaction by the end of the fourth quarter 2019. On December 31, 2018, the Company acquired certain assets of Celtic Energy, Inc. (“Celtic”), a nationally recognized energy consulting firm that specializes in energy project management and oversight. The aggregate purchase price is up to $1,900 , including $1,000 in cash, $300 in promissory note (bearing interest at 3% ), payable in three equal installments of $100 on the first, second and third anniversaries of December 31, 2018 and $200 of the Company’s common stock ( 3,227 shares) issued at the closing date. The purchase price also includes $200 of the Company’s common stock payable on the first anniversary of December 31, 2018. Further, the purchase price includes a $200 earn-out of cash, which was recorded at an estimated fair value of $181 . In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for Celtic, the Company performed a purchase price allocation. 2018 Acquisitions On November 2, 2018 the Company acquired CHI Engineering, Inc. (“CHI”), an infrastructure engineering firm based in Portsmouth, New Hampshire. CHI is a leading provider of engineering, procurement, and construction management services to the liquefied natural gas (“LNG”), petroleum gas (“LPG”) and Natural Gas industries. CHI’s client base includes the majority of LNG facility owner/operators in the U.S. The aggregate purchase price of this acquisition is up to $53,000 , including $30,000 in cash, $15,000 in promissory notes (bearing interest at 3% ), payable in four equal installments of $3,750 on the first, second, third and fourth anniversaries of November 2, 2018 and $3,000 of the Company’s common stock ( 36,729 shares) issued at the closing date. In July 2019, the Company received $2,360 from the sellers of CHI, as a working capital adjustment which was recorded a reduction of the purchase price paid for the acquisition of CHI. The purchase price also includes $3,000 of the Company’s common stock payable in three installments of $1,000 , due on the first, second and third anniversaries of November 2, 2018. The purchase price also includes a $2,000 earn-out of cash (at a 3% interest rate which begins to accrue on January 1, 2020), which was recorded at its estimated fair value of $1,547 , based on a probability-weighted approach valuation technique used to determine the fair value of the contingent consideration on the acquisition date. The note and the earn-out are due to related party individuals who became employees of the Company upon the acquisition. In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for CHI, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. On August 24, 2018, the Company acquired all of the outstanding equity interests in CALYX Engineers and Consultants, Inc. (“CALYX”), an infrastructure and transportation firm based in Cary, North Carolina. CALYX provides roadway and structure design, transportation planning, water resources, construction services, utility services, building structure design, land development, traffic services, cultural resources, surveying, and environmental services. CALYX serves both public and private clients, including state departments of transportation, municipalities, developers, higher education, and healthcare systems. The acquisition of CALYX will expand our infrastructure engineering service in the southeast United States. The purchase price of this acquisition is $34,000 , subject to customary closing working capital adjustments, including $25,000 in cash, $4,000 in promissory notes (bearing interest at 3.75% ), payable in four installments of $1,000 , due on the first, second, third and fourth anniversaries of August 24, 2018 (see Note 10), $3,000 of the Company’s common stock ( 36,379 shares) as of the closing date of the acquisition, and $2,000 in cash payable within 120 days of the closing date. The note is due to related party individuals who became employees of the Company. In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for CALYX, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. On February 2, 2018, the Company acquired CSA (M&E) Ltd. (“CSA”), a leading provider of Mechanical, Electrical, and Plumbing (MEP) engineering and sustainability consulting services. CSA provides MEP and sustainability services for the retail, education, healthcare, industrial, corporate, hospitality and infrastructure market sectors with offices in Hong Kong, Macau and the UAE. CSA serves private and public sector clients throughout Asia and the Middle East. The purchase price of this acquisition was up to $4,200 , including $2,000 in cash; $600 in promissory notes (bearing interest at 3% ), payable in four installments of $150 , due on the first, second, third and fourth anniversaries of February 2, 2018, the effective date of the acquisition; and $150 of the Company’s common stock ( 2,993 shares) issued as of the closing date. The purchase price also includes $250 of the Company’s common stock payable in two installments of $125 , due on the first and second anniversaries of the acquisition. The purchase price also included a non-interest bearing earn-out of up to $1,200 payable in cash and stock, subject to the achievement of certain agreed upon financial metrics for fiscal year 2018. The earn-out of $1,200 is non-interest bearing and was recorded at its estimated fair value of $899 , based on a probability-weighted approach valuation technique used to determine the fair value of the contingent consideration on the acquisition date. The note and the earn-out are due to a related party individual who became an employee of the Company upon the acquisition. In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for CSA, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. On January 12, 2018, the Company acquired all of the outstanding equity interest in Butsko Utility Design, Inc. (“Butsko”). Butsko is leading provider of utility planning and design services serving both public and private sector clients through its offices in Southern California and Washington. The purchase price of this acquisition was up to $4,250 , including $1,500 in cash; $1,000 in promissory notes (bearing interest at 3% ), payable in four installments of $250 , due on the first, second, third and fourth anniversaries of January 12, 2018, the effective date of the acquisition; and $300 of the Company’s common stock ( 5,630 shares) issued as of the closing date. The purchase price also includes $600 of the Company’s common stock payable in two installments of $300 , due on the first and second anniversaries of the acquisition. The purchase price also included a non-interest bearing earn-out of up to $850 payable in cash and stock, subject to the achievement of certain agreed upon financial metrics for fiscal year 2018. The earn-out of $850 is non-interest bearing and was recorded at its estimated fair value of $666 , based on a probability-weighted approach valuation technique used to determine the fair value of the contingent consideration on the acquisition date. The note and the earn-out are due to a related party individual who became an employee of the Company upon the acquisition. In order to determine the fair values of tangible and intangible assets acquired and liabilities assumed for Butsko, the Company engaged a third-party independent valuation specialist to assist in the determination of fair values. The following table summarizes the fair values of the assets acquired and liabilities assumed as of the acquisition date for the acquisitions closed during 2019 and 2018 : 2019 2018 Cash $ 75 $ 345 Billed and unbilled receivables, net 19,417 20,999 Property and equipment 1,580 3,122 Prepaid expenses 2,056 589 Other assets 164 83 Intangible assets: Customer relationships 12,839 32,267 Trade name 910 2,479 Customer backlog 852 8,007 Non-compete 1,647 4,306 Total Assets 39,540 72,197 Liabilities (9,263 ) (11,589 ) Deferred tax liabilities (4,495 ) (8,903 ) Net assets acquired $ 25,782 $ 51,705 Consideration paid (Cash, Notes and/or stock) $ 42,898 $ 90,516 Contingent earn-out liability (Cash and stock) 2,570 3,112 Total Consideration $ 45,468 $ 93,628 Excess consideration over the amounts assigned to the net assets acquired (Goodwill) $ 19,686 $ 41,923 Goodwill was recorded based on the amount by which the purchase price exceeded the fair value of the net assets acquired and the amount is attributable to the reputation of the business acquired, the workforce in place and the synergies to be achieved from these acquisitions. See Note 8 for further information on goodwill and identified intangibles. The consolidated financial statements of the Company for the three and nine months ended September 28, 2019 and September 29, 2018 include the results of operations from any business acquired from their respective dates of acquisition during each of the respective period as follows: Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 Gross Revenues $ 16,537 $ 4,984 $ 22,229 $ 11,374 Income before income taxes $ 1,272 $ 1,356 $ 2,211 $ 2,008 The following table presents the unaudited, pro forma consolidated results of operations (in thousands, except per share amounts) for the three and nine months ended September 28, 2019 and September 29, 2018 as if the acquisitions of CHI, CALYX, The Sextant Group, Page One, Alta, WHPacific and GeoDesign had occurred as of January 1, 2018. The pro forma information provided below is compiled from the pre-acquisition financial information of CHI, CALYX, The Sextant Group, Page One, Alta, WHPacific and GeoDesign which includes pro forma adjustments for amortization expense, adjustments to certain expenses, and the income tax impact of these adjustments. The pro forma results are not necessarily indicative of (i) the results of operations that would have occurred had the operations of these acquisitions actually been acquired on January 1, 2018 or (ii) future results of operations: Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 Gross revenues $ 131,032 $ 141,249 $ 403,162 $ 417,672 Net income $ 5,843 $ 9,526 $ 19,407 $ 24,550 Basic earnings per share $ 0.48 $ 0.84 $ 1.61 $ 2.28 Diluted earnings per share $ 0.46 $ 0.81 $ 1.55 $ 2.18

Billed and Unbilled Receivables

Billed and Unbilled Receivables	9 Months Ended
	Sep. 28, 2019
Receivables [Abstract]
Billed and Unbilled Receivables	Billed and Unbilled Receivables Billed and Unbilled Receivables consists of the following: September 28, 2019 December 29, 2018 Billed receivables $ 114,148 $ 101,482 Less: allowance for doubtful accounts (4,557 ) (3,158 ) Billed receivables, net $ 109,590 $ 98,324 Unbilled receivables $ 55,206 $ 44,799 Less: allowance for doubtful accounts (1,388 ) (1,388 ) Unbilled receivables, net $ 53,818 $ 43,411

Property and Equipment, net

Property and Equipment, net	9 Months Ended
	Sep. 28, 2019
Property, Plant and Equipment [Abstract]
Property and Equipment, net	Property and Equipment, net Property and equipment, net, consists of the following: September 28, 2019 December 29, 2018 Office furniture and equipment $ 2,877 $ 2,328 Computer equipment 12,382 11,640 Survey and field equipment 6,388 5,526 Leasehold improvements 3,981 2,541 25,628 22,035 Accumulated depreciation (13,279 ) (10,358 ) $ 12,349 $ 11,677 Depreciation expense was $ 1,317 and $ 3,591 for the three and nine months ended September 28, 2019 , respectively and $ 1,077 and $ 3,111 for the three and nine months ended September 29, 2018 , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 28, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill The changes in the carrying value by reportable segment for the nine months ended September 28, 2019 were as follows: Nine Months Ended December 29, 2018 2019 Acquisitions Disposed/Adjustments September 28, 2019 INF $ 69,255 $ 13,797 $ (2,193 ) $ 80,859 BTS 71,675 5,889 — 77,564 Total $ 140,930 $ 19,686 $ (2,193 ) $ 158,423 Goodwill of approximately $ 5,712 and $ 13,549 from acquisitions during the nine months ended September 28, 2019 and September 29, 2018 , respectively, is expected to be deductible for income tax purposes. In July 2019, the Company received $2,360 from the sellers of CHI, as a working capital adjustment which was recorded a reduction of goodwill and the purchase price paid for the acquisition of CHI. Intangible Assets Intangible assets, net, as of September 28, 2019 and December 29, 2018 consist of the following: September 28, 2019 December 29, 2018 Gross Carrying Amount Accumulated Amortization Net Amount Gross Carrying Amount Accumulated Amortization Net Amount Customer relationships (1) $ 113,794 $ (26,434 ) $ 87,360 $ 100,956 $ (18,724 ) $ 82,232 Trade name (2) 9,798 (8,084 ) 1,714 8,888 (6,469 ) 2,419 Customer backlog (1) 16,853 (10,966 ) 5,887 16,000 (6,730 ) 9,270 Favorable lease (3) 553 (233 ) 320 552 (197 ) 355 Non-compete (4) 10,201 (4,794 ) 5,407 8,554 (3,074 ) 5,480 Total $ 151,199 $ (50,511 ) $ 100,688 $ 134,950 $ (35,194 ) $ 99,756 (1) Amortized on a straight-line basis over estimated lives ( 1 to 10 years ) (2) Amortized on a straight-line basis over their estimated lives ( 1 to 3 years ) (3) Amortized on a straight-line basis over the remaining lease term of 9 years (4) Amortized on a straight-line basis over their contractual lives ( 4 to 5 years ) Amortization expense was $ 5,234 and $ 15,317 for the three and nine months ended September 28, 2019 , respectively and $ 2,980 and $ 8,549 for the three and nine months ended September 29, 2018 , respectively.

Accrued Liabilities

Accrued Liabilities	9 Months Ended
	Sep. 28, 2019
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities Accrued liabilities consist of the following: September 28, 2019 December 29, 2018 Accrued lease liability $ 10,768 $ — Accrued vacation 9,958 7,994 Payroll and related taxes 5,383 8,136 Benefits 1,708 1,598 Unrecognized tax benefits 878 548 Professional liability reserve 1,168 157 Deferred rent — 779 Other 3,791 1,641 Total $ 33,654 $ 20,853

Notes Payable and Other Obligat

Notes Payable and Other Obligations	9 Months Ended
	Sep. 28, 2019
Payables and Accruals [Abstract]
Notes Payable and Other Obligations	Notes Payable and Other Obligations Notes payable and other obligations consists of the following: September 28, 2019 December 29, 2018 Other obligations $ 3,774 $ 4,893 Uncollateralized promissory notes 41,765 40,001 Senior credit facility 10,000 — Capital leases 2,676 2,092 Total notes payable and other obligations 58,215 46,986 Current portion of notes payable and other obligations (17,578 ) (17,139 ) Notes payable and other obligations, less current portion 40,638 29,847 As of September 28, 2019 and December 29, 2018 , the carrying amount of debt obligations approximates their fair values based on Level 2 inputs as the terms are comparable to terms currently offered by local lending institutions for arrangements with similar terms to industry peers with comparable credit characteristics. Senior Credit Facility On December 20, 2018, we entered into an amendment to a Credit Agreement (the “Credit Agreement”) dated December 7, 2016 with Bank of America, N.A. (“Bank of America”) and Merrill Lynch, Pierce, Fenner & Smith Incorporated (“MLPFS”). Pursuant to the amended Credit Agreement, Bank of America agreed to be the sole administrative agent for a five-year $125,000 Senior Secured Revolving Credit Facility (“Senior Credit Facility”) to the Company and, together with PNC Bank, National Association and Regions Bank as the other lenders under the Senior Credit Facility, has committed to lend to the Company all of the Senior Credit Facility, subject to certain terms and conditions. The Senior Credit Facility is secured by a first priority lien on substantially all of the assets of the Company. MLPFS has undertaken to act as sole lead arranger and sole book manager for the Senior Credit Facility. In addition, the Senior Credit Facility includes an accordion feature permitting the Company to request an increase in the Senior Credit Facility by an additional amount of up to $100,000 . The Senior Credit Facility includes a $20,000 sublimit for the issuance of standby letters of credit and a $15,000 sublimit for swingline loans. The proceeds of the Senior Credit Facility are intended to be used (i) to finance permitted acquisitions, (ii) for capital expenditures, and (iii) for general corporate purposes. Borrowings under the Credit Agreement are at variable rates which are, at our option, tied to a Eurocurrency rate equal to LIBOR (London Interbank Offered Rate) plus an applicable rate or a base rate denominated in U.S. dollars. Interest rates are subject to change based on our Consolidated Senior Leverage Ratio (as defined in the Credit Agreement). The Senior Credit Facility contains certain financial covenants, including a maximum leverage ratio of 4.0 :1 and a minimum fixed charge coverage ratio of 1.20 :1. Furthermore, the Senior Credit Facility also contains financial reporting covenant provisions and other covenants, representations, warranties, indemnities, and events of default that are customary for facilities of this type. As of September 28, 2019 and December 29, 2018 , the Company is in compliance with the financial covenants. As of September 28, 2019 there was $10,000 outstanding on the Senior Credit Facility. As of December 29, 2018 , we had no outstanding balance on the Senior Credit Facility. Other Obligations On July 1, 2019, the Company acquired GeoDesign. The purchase price allowed for the payment of $425 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable on the first and second anniversary of July 1, 2019. At September 28, 2019, the outstanding balance of this obligation was $382 . On June 3, 2019, the Company acquired Page One. The purchase price allowed for the payment of $200 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable on the first anniversary of June 3, 2019. At September 28, 2019, the outstanding balance of this obligation was $181 . On December 31, 2018, the Company acquired certain assets of Celtic. The purchase price allowed for the payment of $200 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable on the first anniversary of December 31, 2018. At September 28, 2019 the outstanding balance of this obligation was $181 . On November 2, 2018, the Company acquired CHI. The purchase price allowed for the payment of $3,000 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable in three equal annual installments. At September 28, 2019 and December 29, 2018 , the outstanding balance of this obligation was $2,631 . On February 2, 2018, the Company acquired CSA. The purchase price allowed for the payment of $250 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable in two equal annual installments. At September 28, 2019 and December 29, 2018 , the outstanding balance of this obligation was $111 and $222 , respectively. On January 12, 2018, the Company acquired all of the outstanding equity interest in Butsko. The purchase price allowed for the payment of $600 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable in two equal annual installments. At September 28, 2019 and December 29, 2018 , the outstanding balance of this obligation was $267 and $534 , respectively. On September 6, 2017, the Company acquired all of the outstanding equity interest in Marron. The purchase price allowed for the payment of $133 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable in two equal annual installments. There was no outstanding balance on this obligation as of September 28, 2019. At December 29, 2018 , the outstanding balance of this obligation was $55 . On June 6, 2017, the Company acquired all of the outstanding equity interest in RDK. The purchase price allowed for the payment of $1,333 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable in two equal annual installments. There was no outstanding balance on this obligation as of September 28, 2019. At December 29, 2018 , the outstanding balance of this obligation $ 504 . On May 20, 2016, the Company acquired all of the outstanding equity interests of Dade Moeller. The purchase price allowed for the payment of $3,000 in shares of the Company’s stock or a combination of cash and shares of the Company’s stock, at our discretion, payable in three equal annual installments of $1,000 . There was no outstanding balance on this obligation as of September 28, 2019. At December 29, 2018 , the outstanding balance of this obligation was $936 . Uncollateralized Promissory Notes On July 1, 2019, the Company acquired GeoDesign. The purchase price included an uncollateralized $2,000 promissory note bearing interest at 4.0% (“GeoDesign Note”) and payable in four equal annual installments. The outstanding balance of the GeoDesign Note was $2,000 as of September 28, 2019. On June 3, 2019, the Company acquired Alta. The purchase price included an uncollateralized $2,000 promissory note bearing interest at 4.0% (“Alta Note”) and payable in four equal annual installments. The outstanding balance of the Alta Note was $2,000 as of September 28, 2019. On June 3, 2019, the Company acquired Page One. The purchase price included an uncollateralized $1,000 promissory note bearing interest at 3.0% (“Page One Note”) and payable in three equal annual installments. The outstanding balance of the Page One Note was $1,000 as of September 28, 2019. On March 22, 2019, the Company acquired The Sextant Group. The purchase price included an uncollateralized $4,000 promissory note bearing interest at 4.0% (“The Sextant Group Note”) and payable in four equal annual installments. The outstanding balance of The Sextant Group Note was $4,000 as of September 28, 2019. On December 31, 2018, the Company acquired certain assets of Celtic. The purchase price included an uncollateralized $300 promissory note bearing interest at 3.0% (the “Celtic Note”) payable in three equal annual installments. The outstanding balance of the Celtic note was $300 as of September 28, 2019. On November 2, 2018, the Company acquired CHI. The purchase price included an uncollateralized $15,000 promissory note bearing interest at 3.0% (the “CHI Note”) payable in four equal annual installments. The outstanding balance of the CHI Note was $15,000 as of September 28, 2019 and December 29, 2018 . On August 24, 2018, the Company acquired CALYX. The purchase price included an uncollateralized $4,000 promissory note bearing interest at 3.75% (the “CALYX Note”) payable in four equal annual installments. The outstanding balance of the CALYX Note was $3,000 and $4,000 as of September 28, 2019 and December 29, 2018 , respectively. On February 2, 2018, the Company acquired CSA. The purchase price included an uncollateralized $600 promissory note bearing interest at 3.0% (the “CSA Note”) payable in four equal annual installments. The outstanding balance of the CSA Note was $450 and $600 as of September 28, 2019 and December 29, 2018 , respectively. On January 12, 2018, the Company acquired all of the outstanding equity interest in Butsko. The purchase price included an uncollateralized $1,000 promissory note bearing interest at 3.0% (the “Butsko Note”) payable in four equal annual installments. The outstanding balance of the Butsko Note was $750 and $1,000 as of September 28, 2019 and December 29, 2018 , respectively. On September 6, 2017, the Company acquired all of the outstanding interests in Marron. The purchase price included an uncollateralized $300 promissory note bearing interest at 3.0% (the “Marron Note”) payable in three equal annual installments. The outstanding balance of the Marron Note was $100 and $200 as of September 28, 2019 and December 29, 2018 , respectively. On June 6, 2017, the Company acquired all of the outstanding equity interest in RDK. The purchase price included an uncollateralized $5,500 promissory note bearing interest at 3.0% (the “RDK Note”) payable in four equal annual installments. The outstanding balance of the RDK Note was $2,750 and $4,125 as of September 28, 2019 and December 29, 2018 , respectively. On May 4, 2017, the Company acquired all of the outstanding equity interest in H&K. The purchase price included an uncollateralized $600 promissory note bearing interest at 3.0% (the “H&K Note”) payable in four equal annual installments. The outstanding balance of the H&K Note was $300 and $450 as of September 28, 2019 and December 29, 2018 , respectively. On May 1, 2017, the Company acquired all of the outstanding equity interest in Lochrane. The purchase price included an uncollateralized $1,650 promissory note bearing interest at 3.0% (the “Lochrane Note”) payable in four equal annual installments. The outstanding balance of the Lochrane Note was $825 and $1,238 as of September 28, 2019 and December 29, 2018 , respectively. On December 6, 2016, the Company acquired all of the outstanding interests of CivilSource. The purchase price included an uncollateralized $3,500 promissory note bearing interest at 3.0% (the “CivilSource Note”) payable in four equal annual installments. The outstanding balance of the CivilSource Note was $1,606 and $2,625 as of September 28, 2019 and December 29, 2018 , respectively. On November 30, 2016, the Company acquired all of the outstanding interests of Hanna. The purchase price included an uncollateralized $2,700 promissory note bearing interest at 3.0% (the “Hanna Note”) payable in four equal annual installments. The outstanding balance of the Hanna Note was $1,350 as of September 28, 2019 and December 29, 2018 . On October 26, 2016, the Company acquired all of the outstanding interests of JBA. The purchase price included an uncollateralized $7,000 promissory note bearing interest at 3.0% (the “JBA Note”) payable in five equal annual installments. The outstanding balance of the JBA Note was $4,200 as of September 28, 2019 and December 29, 2018 . On September 12, 2016, the Company acquired certain assets of Weir. The purchase price included an uncollateralized $500 promissory note bearing interest at 3.0% (the “Weir Note”) payable in four equal annual installments. The outstanding balance of the Weir Note was $125 and $250 as of September 28, 2019 and December 29, 2018 , respectively. On May 20, 2016, the Company acquired all of the outstanding equity interests of Dade Moeller. The purchase price included an aggregate of $6,000 of uncollateralized promissory notes bearing interest at 3.0% (the “Dade Moeller Notes”) payable in four equal annual installments. The outstanding balance of the Dade Moeller Notes was $1,497 and $3,036 as of September 28, 2019 and December 29, 2018 , respectively. On July 1, 2015, the Company acquired all of the outstanding equity interests of RBA. The purchase price included an uncollateralized $4,000 promissory notes bearing interest at 3.0% (the “RBA Note”) payable in four equal annual installments. There was no outstanding balance on the RBA Note as of September 28, 2019. The outstanding balance of the RBA Note was $1,000 as of December 29, 2018 . On January 30, 2015, the Company acquired all of the outstanding equity interests of JLA. The purchase price included an uncollateralized $1,250 promissory note bearing interest at 3.5% (the “JLA Note”) payable in four equal annual installments. There was no outstanding balance on the JLA Note as of September 28, 2019. As of December 29, 2018 , the outstanding balance of the JLA note was $313 .

Contingent Consideration

Contingent Consideration	9 Months Ended
	Sep. 28, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingent Consideration	Contingent Consideration The following table summarizes the changes in the carrying value of estimated contingent consideration: September 28, 2019 December 29, 2018 Contingent consideration, beginning of the year $ 4,698 $ 1,890 Additions for acquisitions 2,737 3,112 Reduction of liability for payments made (1,938 ) (728 ) Increase of liability related to re-measurement of fair value 49 424 Total contingent consideration, end of the period 5,546 4,698 Current portion of contingent consideration (3,351 ) (1,845 ) Contingent consideration, less current portion $ 2,195 $ 2,853

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 28, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation, Claims and Assessments We are subject to certain claims and lawsuits typically filed against the engineering, consulting and construction profession, alleging primarily professional errors or omissions. The Company carries professional liability insurance, subject to certain deductibles and policy limits, against such claims. However, in some actions, parties are seeking damages that exceed our insurance coverage or for which we are not insured. While management does not believe that the resolution of these claims will have a material adverse effect, individually or in aggregate, on its financial position, results of operations or cash flows, management acknowledges the uncertainty surrounding the ultimate resolution of these matters.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 28, 2019
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation In October 2011, our stockholders approved the 2011 Equity Incentive Plan, which was subsequently amended and restated in March 2013 (as amended, the “2011 Equity Plan”). The 2011 Equity Plan provides directors, executive officers, and other employees of the Company with additional incentives by allowing them to acquire ownership interest in the business and, as a result, encouraging them to contribute to the Company’s success. We may provide these incentives through the grant of stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares and units, and other cash-based or stock-based awards. As of September 28, 2019 , 1,256,403 shares of common stock are authorized and reserved for issuance under the 2011 Equity Plan. This reserve automatically increases on each January 1 from 2014 through 2023, by an amount equal to the smaller of (i) 3.5% of the number of shares issued and outstanding on the immediately preceding December 31, or (ii) an amount determined by our Board of Directors. The restricted shares of common stock granted generally provide for service-based vesting after two to four years following the grant date. The following summarizes the activity of restricted stock awards during the nine months ended September 28, 2019 : Number of Unvested Restricted Shares of Common Stock and Restricted Stock Units Weighted Average Grant Date Fair Value December 29, 2018 626,911 $ 39.81 Granted 248,694 $ 72.98 Vested (204,655) $ 20.24 Forfeited (35,263) $ 51.84 September 28, 2019 635,687 $ 58.42 Share-based compensation expense relating to restricted stock awards during the three and nine months ended September 28, 2019 was $2,822 and $6,989 , respectively and $1,902 and $4,541 , respectively, for the three and nine months ended September 29, 2018 . Approximately $19,867 of deferred compensation, which is expected to be recognized over the remaining weighted average vesting period of 2.33 years, is unrecognized at September 28, 2019 . The total fair value of restricted shares vested during the nine months ended September 28, 2019 and September 29, 2018 was $ 14,514 and $7,422 , respectively.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 28, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes As of September 28, 2019 and December 29, 2018 , we had net deferred income tax liabilities of $16,881 and $16,224 , respectively. No valuation allowance against our deferred income tax assets is needed as of September 28, 2019 and December 29, 2018 as it is more-likely-than-not that the positions will be realized upon settlement. Deferred income tax liabilities primarily relate to intangible assets and accounting basis adjustments where we have a future obligation for tax purposes. Our consolidated effective income tax rate was 22.9% and 24.1% , respectively, for the three and nine months ended September 28, 2019 and 24.5% and 24.8% , respectively, for the three and nine months ended September 29, 2018 . Our tax provision includes an income tax benefit related to the vesting of restricted stock totaling $121 and $2,593 , respectively, for the three and nine months ended September 28, 2019 and $95 and $1,210 , respectively, for the three and nine months ended September 29, 2018 . We evaluate tax positions for recognition using a more-likely-than-not recognition threshold, and those tax positions eligible for recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon the effective settlement with a taxing authority that has full knowledge of all relevant information. The California Franchise Tax Board (“CFTB”) challenged research and development tax credits generated for the years 2012 to 2014. Fiscal years 2012 through 2018 are considered open tax years in the State of California and 2015 through 2018 in the U.S. federal jurisdiction and other state jurisdictions. The evaluation by the CFTB is ongoing and at September 28, 2019 and December 29, 2018 , we had $878 and $ 548 , respectively, of unrecognized tax benefits, which if recognized would affect our effective tax rate. It is not expected that there will be a significant change in the unrecognized tax benefits in the next 12 months.

Reportable Segments

Reportable Segments	9 Months Ended
	Sep. 28, 2019
Segment Reporting [Abstract]
Reportable Segments	Reportable Segments We report segment information in accordance with ASC Topic No. 280 “ Segment Reporting” (“Topic No. 280”). Our Chief Executive Officer is the chief operating decision maker and organized the Company into two operating and reportable segments: Infrastructure (INF), which includes our engineering, civil program management, and construction quality assurance practices; and Building, Technology & Sciences (BTS), which includes our energy, environmental practices and buildings program management practices. We evaluate the performance of these reportable segments based on their respective operating income before the effect of amortization expense related to acquisitions and other unallocated corporate expenses. We account for inter-segment revenues and transfers as if the sales and transfers were to third parties. All intercompany balances and transactions are eliminated in consolidation. The following tables set forth summarized financial information concerning our reportable segments: Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 Gross revenues INF $ 89,035 $ 64,053 $ 250,354 $ 180,611 BTS 43,060 41,441 128,706 125,344 Elimination of inter- segment revenues (1,063 ) (1,309 ) (2,720 ) (3,218 ) Total gross revenues $ 131,032 $ 104,185 $ 376,340 $ 302,737 Segment income before taxes INF $ 14,008 $ 11,108 $ 41,273 $ 28,951 BTS 6,871 7,236 20,287 21,069 Total Segment income before taxes 20,879 18,344 61,560 50,020 Corporate (1) (13,476 ) (8,821 ) (37,958 ) (26,107 ) Total income before taxes $ 7,403 $ 9,523 $ 23,602 $ 23,913 (1) Includes amortization of intangibles of $ 5,234 and 15,317 for the three and nine months ended September 28, 2019 , respectively and $2,980 and $8,549 for the three and nine months ended September 29, 2018 , respectively. Upon adoption of Topic 606, we disaggregate our gross revenues from contracts with customers by geographic location, customer-type and contract-type for each of our reportable segments. Disaggregated revenues include the elimination of inter-segment revenues which has been allocated to each segment. We believe this best depicts how the nature, amount, timing and uncertainty of our revenues and cash flows are affected by economic factors. Three Months Ended September 28, 2019 Nine Months Ended September 28, 2019 INF BTS Total INF BTS Total Gross revenues by Geographic Location United States $ 87,572 $ 41,872 $ 129,444 $ 247,634 $ 121,829 $ 369,463 Foreign — 1,588 1,588 — 6,877 6,877 Total gross revenues $ 87,572 $ 43,460 $ 131,032 $ 247,634 $ 128,706 $ 376,340 Three Months Ended September 29, 2018 Nine Months Ended September 29, 2018 INF BTS Total INF BTS Total Gross revenues by Geographic Location United States $ 63,514 $ 38,678 $ 102,192 $ 178,531 $ 115,371 $ 293,902 Foreign — 1,993 1,993 — 8,835 8,835 Total gross revenues $ 63,514 $ 40,671 $ 104,185 $ 178,531 $ 124,206 $ 302,737 Three Months Ended September 28, 2019 Nine Months Ended September 28, 2019 INF BTS Total INF BTS Total Gross revenues by Customer Public and quasi-public sector $ 69,297 $ 17,899 $ 87,196 $ 209,837 $ 50,471 $ 260,308 Private sector 18,275 25,561 43,836 37,797 78,235 116,032 Total gross revenues $ 87,572 $ 43,460 $ 131,032 $ 247,634 $ 128,706 $ 376,340 Three Months Ended September 29, 2018 Nine Months Ended September 29, 2018 INF BTS Total INF BTS Total Gross revenues by Customer Public and quasi-public sector $ 58,157 $ 15,469 $ 73,626 $ 162,193 $ 49,519 $ 211,712 Private sector 5,357 25,202 30,559 16,338 74,687 91,025 Total gross revenues $ 63,514 $ 40,671 $ 104,185 $ 178,531 $ 124,206 $ 302,737 Three Months Ended September 28, 2019 Nine Months Ended September 28, 2019 INF BTS Total INF BTS Total Gross revenues by Contract Type Cost-reimbursable contracts $ 84,426 $ 31,797 $ 116,223 $ 240,166 $ 99,935 $ 340,101 Fixed-unit price contracts 3,146 11,663 14,809 7,468 28,771 36,239 Total gross revenues $ 87,572 $ 43,460 $ 131,032 $ 247,634 $ 128,706 $ 376,340 Three Months Ended September 29, 2018 Nine Months Ended September 29, 2018 INF BTS Total INF BTS Total Gross revenues by Contract Type Cost-reimbursable contracts $ 63,507 $ 32,196 $ 95,703 $ 178,255 $ 98,756 $ 277,011 Fixed-unit price contracts 7 8,475 8,482 276 25,450 25,726 Total gross revenues $ 63,514 $ 40,671 $ 104,185 $ 178,531 $ 124,206 $ 302,737

Leases

Leases	9 Months Ended
	Sep. 28, 2019
Leases [Abstract]
Leases	Leases Our operating leases consist of various office facilities, which we lease from unrelated parties. We use a portfolio approach to account for such leases due to the similarities in characteristics and apply an incremental borrowing rate equal to the interest rate of our existing secured line of credit. Our office leases with an initial term of 12 months or less are not recorded on the balance sheet. We account for lease components (e.g. fixed payments including rent, real estate taxes and common area maintenance costs) as a single lease component. Some of our leases include one or more options to renew the lease term at our sole discretion; however, these are not included in the calculation of our lease liability or ROU lease asset because they are not reasonably certain of exercise. We also lease vehicles through a fleet leasing program. The payments for the vehicles are based on the terms selected. We have determined that it is reasonably certain that the leased vehicles will be held beyond the period in which the entire capitalized value of the vehicle has been paid to the lessor. As such, the capitalized value is the delivered price of the vehicle. Our vehicle leases are classified as financing leases. Leases Classification September 28, 2019 Assets Operating lease assets Right-of-use lease asset, net (1) $ 42,366 Finance lease assets Property and equipment, net (1) 2,311 Total leased assets $ 44,677 Liabilities Current Operating Accrued liabilities $ 10,768 Finance Current portion of notes payable and other obligations 896 Noncurrent Operating Long-term lease liability 32,781 Finance Notes payable and other obligations, less current portion 1,780 Total lease liabilities $ 46,225 (1): At September 28, 2019 , operating right of-use lease assets and finance lease assets are recorded net of accumulated amortization of $6,770 and $1,365 , respectively. Three Months Ended Nine Months Ended Lease Cost Classification September 28, 2019 September 28, 2019 Operating lease cost Facilities and facilities related $ 2,995 $ 8,237 Finance lease cost Amortization of financing lease assets Depreciation and amortization 193 517 Interest on lease liabilities Interest expense 26 71 Total lease cost $ 3,214 $ 8,825 Maturity of Lease Liabilities Operating Leases Finance Leases 2019 $ 3,257 $ 234 2020 11,742 975 2021 10,079 874 2022 7,325 611 2023 5,934 353 Thereafter 9,965 103 Total lease payments 48,302 3,150 Less: Interest 4,753 474 Present value of lease liabilities $ 43,549 $ 2,676 Weighted - Average Remaining Lease Term (Years) September 28, 2019 Operating leases 5.3 Finance leases 2.7 Weighted - Average Discount Rate Operating leases 4% Finance leases 7% Nine Months Ended Supplemental Cash Flow Information September 28, 2019 Operating cash flows from operating leases $ 7,833 Financing cash flows from finance leases $ 543 Right-of-use assets obtained in exchange for lease obligations Operating leases $ 14,251 Future minimum payments under non-cancelable operating leases as of December 29, 2018 were as follows: Years Ended Amount 2019 $ 9,506 2020 8,054 2021 7,224 2022 5,364 2023 4,504 Thereafter 7,704 Total minimum lease payments $ 42,356
Leases	Leases Our operating leases consist of various office facilities, which we lease from unrelated parties. We use a portfolio approach to account for such leases due to the similarities in characteristics and apply an incremental borrowing rate equal to the interest rate of our existing secured line of credit. Our office leases with an initial term of 12 months or less are not recorded on the balance sheet. We account for lease components (e.g. fixed payments including rent, real estate taxes and common area maintenance costs) as a single lease component. Some of our leases include one or more options to renew the lease term at our sole discretion; however, these are not included in the calculation of our lease liability or ROU lease asset because they are not reasonably certain of exercise. We also lease vehicles through a fleet leasing program. The payments for the vehicles are based on the terms selected. We have determined that it is reasonably certain that the leased vehicles will be held beyond the period in which the entire capitalized value of the vehicle has been paid to the lessor. As such, the capitalized value is the delivered price of the vehicle. Our vehicle leases are classified as financing leases. Leases Classification September 28, 2019 Assets Operating lease assets Right-of-use lease asset, net (1) $ 42,366 Finance lease assets Property and equipment, net (1) 2,311 Total leased assets $ 44,677 Liabilities Current Operating Accrued liabilities $ 10,768 Finance Current portion of notes payable and other obligations 896 Noncurrent Operating Long-term lease liability 32,781 Finance Notes payable and other obligations, less current portion 1,780 Total lease liabilities $ 46,225 (1): At September 28, 2019 , operating right of-use lease assets and finance lease assets are recorded net of accumulated amortization of $6,770 and $1,365 , respectively. Three Months Ended Nine Months Ended Lease Cost Classification September 28, 2019 September 28, 2019 Operating lease cost Facilities and facilities related $ 2,995 $ 8,237 Finance lease cost Amortization of financing lease assets Depreciation and amortization 193 517 Interest on lease liabilities Interest expense 26 71 Total lease cost $ 3,214 $ 8,825 Maturity of Lease Liabilities Operating Leases Finance Leases 2019 $ 3,257 $ 234 2020 11,742 975 2021 10,079 874 2022 7,325 611 2023 5,934 353 Thereafter 9,965 103 Total lease payments 48,302 3,150 Less: Interest 4,753 474 Present value of lease liabilities $ 43,549 $ 2,676 Weighted - Average Remaining Lease Term (Years) September 28, 2019 Operating leases 5.3 Finance leases 2.7 Weighted - Average Discount Rate Operating leases 4% Finance leases 7% Nine Months Ended Supplemental Cash Flow Information September 28, 2019 Operating cash flows from operating leases $ 7,833 Financing cash flows from finance leases $ 543 Right-of-use assets obtained in exchange for lease obligations Operating leases $ 14,251 Future minimum payments under non-cancelable operating leases as of December 29, 2018 were as follows: Years Ended Amount 2019 $ 9,506 2020 8,054 2021 7,224 2022 5,364 2023 4,504 Thereafter 7,704 Total minimum lease payments $ 42,356

Subsequent Events (Notes)

Subsequent Events (Notes)	9 Months Ended
	Sep. 28, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 6, 2019, the Company and one of its direct subsidiaries (“Merger Sub,” and together with NV5, the “NV5 Parties”), and Geospatial Holdings Inc. (“Geospatial”) and Arlington Capital Partners III, L.P., a Delaware limited partnership, solely in its capacity as representative for the stockholders and optionholders of Geospatial, entered into a definitive Agreement and Plan of Merger (the “Merger Agreement”). The Merger Agreement provides that, at the effective time and upon the terms and subject to the conditions set forth therein and in accordance with applicable law, Merger Sub will merge with and into Geospatial (the “Merger”) with Geospatial continuing as the surviving entity after the Merger and a direct, wholly-owned subsidiary of the Company. The board of directors of NV5 approved the Merger Agreement, the Merger and the other transactions contemplated by the Merger Agreement. The Merger is structured as an all cash transaction, and the Company estimates that its aggregate obligations under the Merger Agreement will be approximately $303 million . In connection with the Merger, the Company entered into a commitment letter (the “Commitment Letter”) with Bank of America, N.A., BofA Securities, Inc., PNC Bank, National Association and PNC Capital Markets LLC (collectively, the “Lead Arrangers”) to amend the Senior Credit Facility to provide additional borrowing facilities (the “Incremental Facility”), including a $150 million term loan tranche and a $90 million increase in the existing $125 million revolving facility, for a total availability of $365 million

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 28, 2019
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The consolidated financial statements of the Company are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for reporting of interim financial information. Pursuant to such rules and regulations, certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Certain amounts in the consolidated financial statements and associated notes may not add due to rounding. All percentages have been calculated using unrounded amounts. In the opinion of management, the accompanying unaudited interim consolidated financial statements of the Company contain all adjustments necessary to present fairly the financial position and results of operations of the Company as of the dates and for the periods presented. Accordingly, these statements should be read in conjunction with the consolidated financial statements and notes contained in the Company’s Annual Report on Form 10-K for the year ended December 29, 2018 (the “2018 Form 10-K”). The results of operations and cash flows for the interim periods presented are not necessarily indicative of the results to be expected for any future interim period or for the full 2019 fiscal year. Goodwill and Intangible Assets Goodwill is the excess of consideration paid for an acquired entity over the amounts assigned to assets acquired, including other identifiable intangible assets and liabilities assumed in a business combination. To determine the amount of goodwill resulting from a business combination, the Company performs an assessment to determine the acquisition date fair value of the acquired company’s tangible and identifiable intangible assets and liabilities. Goodwill is required to be evaluated for impairment on an annual basis or whenever events or changes in circumstances indicate the asset may be impaired. An entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. These qualitative factors include: macroeconomic and industry conditions, cost factors, overall financial performance and other relevant entity-specific events. If the entity determines that this threshold is met, then performing the two-step quantitative impairment test is unnecessary. The two-step impairment test requires a comparison of the carrying value of the assets and liabilities associated with a reporting unit, including goodwill, with the fair value of the reporting unit. The Company determines fair value through multiple valuation techniques, and weights the results accordingly. NV5 Global is required to make certain subjective and complex judgments in assessing whether an event of impairment of goodwill has occurred, including assumptions and estimates used to determine the fair value of its reporting units. If the carrying value of a reporting unit exceeds the fair value of the reporting unit, the Company would calculate the implied fair value of its reporting unit goodwill as compared to the carrying value of its reporting unit goodwill to determine the appropriate impairment charge, if any. The Company has elected to perform its annual goodwill impairment review on August 1 of each year. The Company conducts its annual impairment tests on the goodwill using the quantitative method of evaluating goodwill. Identifiable intangible assets primarily include customer backlog, customer relationships, trade names and non-compete agreements. Amortizable intangible assets are amortized on a straight-line basis over their estimated useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the assets may be impaired. If an indicator of impairment exists, the Company compares the estimated future cash flows of the asset, on an undiscounted basis, to the carrying value of the asset. If the undiscounted cash flows exceed the carrying value, no impairment is indicated. If the undiscounted cash flows do not exceed the carrying value, then impairment, if any, is measured as the difference between fair value and carrying value, with fair value typically based on a discounted cash flow model. On August 1, 2019, the Company conducted its annual impairment tests using the quantitative method of evaluating goodwill. Based on the quantitative analyses the Company determined the fair value of each of the reporting units exceeded its carrying value. Therefore, the goodwill was not impaired and the Company did not recognize an impairment charge relating to goodwill as of August 1, 2019. Furthermore, there were no indicators, events or changes in circumstances that would indicate goodwill was impaired during the period from August 2, 2019 through September 28, 2019. See Note 8 for further information on goodwill and identified intangibles. There have been no significant changes, other than those related to the adopted new accounting standards below, in the Company’s accounting policies from those disclosed in our 2018 Form 10-K.
Adoption of New Accounting Standards	Adoption of New Accounting Standards Leases We adopted ASU No. 2016-2, Leases In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other
Revenue Recognition	Revenue Recognition On the first day of fiscal year 2018, we adopted ASC Topic 606, Revenue from Contracts with Customers (“Topic 606”), using the modified retrospective approach to all contracts that were not completed as of the beginning of fiscal year 2018. We utilize the portfolio method practical expedient, which allows companies to account for multiple contracts as a portfolio, instead of accounting for them on a contract by contract basis (commonly known as the contract method). For our time and materials contracts, we apply the as-invoiced practical expedient, which permits us to recognize revenue as the right to invoice for services performed. The new standard did not materially affect our consolidated net income, financial position, or cash flows. Performance Obligations Some of our contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and therefore, is not distinct. However, in some instances, we may also promise to provide distinct goods or services within a contract, resulting in multiple performance obligations. For contracts with multiple performance obligations, we allocate the contract transaction price to each performance obligation using the best estimate of the standalone selling price of each distinct good or service in the contract. Typically, we sell a customer a specific service and use the expected cost plus a margin approach to estimate the standalone selling price of each performance obligation. The Company’s performance obligations are satisfied as work progresses or at a point in time. Revenue on our cost-reimbursable contracts is recognized over time using direct costs incurred or direct costs incurred to date as compared to the estimated total direct costs for performance obligations because it best depicts the transfer of control to the customer. Contract costs include labor, subcontractors’ costs and other direct costs. Gross revenue from services transferred to customers at a point in time is recognized when the customer obtains control of the asset, which is generally upon delivery and acceptance by the customer of the reports and/or analysis performed. As of September 28, 2019, we had $504,349 of remaining performance obligations, of which $390,454 is expected to be recognized over the next 12 months and the majority of the balance over the next 24 months. Contracts for which work authorizations have been received are included in performance obligations. Most of our government contracts are multi-year contracts for which funding is appropriated on an annual basis, therefore performance obligations includes only those amounts that have been funded and authorized and does not reflect the full amounts we may receive over the term of such contracts. In the case of non-government contracts and project awards, performance obligations includes future revenue at contract or customary rates, excluding contract renewals or extensions that are at the discretion of the client. For contracts with a not-to-exceed maximum amount, we include revenue from such contracts in performance obligations to the extent of the remaining estimated amount. Contract Assets and Liabilities

Organization and Nature of Bu_2

Organization and Nature of Business Operations (Tables)	9 Months Ended
	Sep. 28, 2019
Accounting Policies [Abstract]
Schedule of services provided	NV5 Global provides a wide range of services, including, but not limited to: ● Infrastructure, engineering and support ● Management oversight ● Construction quality assurance, testing and inspection ● Permitting ● Program management ● Inspection and field supervision ● Energy ● Testing inspection and certification ● Environmental ● Forensic engineering ● Planning ● Litigation support ● Design ● Condition assessment ● Consulting ● Compliance certification

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 28, 2019
Earnings Per Share [Abstract]
Schedule of reconciliation of the net income and weighted average shares outstanding for the calculation of basic and diluted earnings per share	The following table represents a reconciliation of the net income and weighted average shares outstanding for the calculation of basic and diluted earnings per share: Three Months Ended Nine Months Ended September 28, September 29, September 28, September 29, Numerator: Net income – basic and diluted $ 5,843 $ 7,285 $ 20,180 $ 19,197 Denominator: Basic weighted average shares outstanding 12,191,405 11,256,946 12,086,588 10,686,040 Effect of dilutive non-vested restricted shares and units 308,240 381,250 325,219 396,577 Effect of issuable shares related to acquisitions 67,321 63,198 73,242 88,594 Effect of warrants — — — 34,537 Diluted weighted average shares outstanding 12,566,966 11,701,394 12,485,049 11,205,748

Business Acquisitions (Tables)

Business Acquisitions (Tables)	9 Months Ended
	Sep. 28, 2019
Business Combinations [Abstract]
Summary of the fair values of the assets acquires and liabilities assumed	The following table summarizes the fair values of the assets acquired and liabilities assumed as of the acquisition date for the acquisitions closed during 2019 and 2018 : 2019 2018 Cash $ 75 $ 345 Billed and unbilled receivables, net 19,417 20,999 Property and equipment 1,580 3,122 Prepaid expenses 2,056 589 Other assets 164 83 Intangible assets: Customer relationships 12,839 32,267 Trade name 910 2,479 Customer backlog 852 8,007 Non-compete 1,647 4,306 Total Assets 39,540 72,197 Liabilities (9,263 ) (11,589 ) Deferred tax liabilities (4,495 ) (8,903 ) Net assets acquired $ 25,782 $ 51,705 Consideration paid (Cash, Notes and/or stock) $ 42,898 $ 90,516 Contingent earn-out liability (Cash and stock) 2,570 3,112 Total Consideration $ 45,468 $ 93,628 Excess consideration over the amounts assigned to the net assets acquired (Goodwill) $ 19,686 $ 41,923
Results of operations from any business acquired	The consolidated financial statements of the Company for the three and nine months ended September 28, 2019 and September 29, 2018 include the results of operations from any business acquired from their respective dates of acquisition during each of the respective period as follows: Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 Gross Revenues $ 16,537 $ 4,984 $ 22,229 $ 11,374 Income before income taxes $ 1,272 $ 1,356 $ 2,211 $ 2,008
Pro forma consolidated results of operations	The pro forma results are not necessarily indicative of (i) the results of operations that would have occurred had the operations of these acquisitions actually been acquired on January 1, 2018 or (ii) future results of operations: Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 Gross revenues $ 131,032 $ 141,249 $ 403,162 $ 417,672 Net income $ 5,843 $ 9,526 $ 19,407 $ 24,550 Basic earnings per share $ 0.48 $ 0.84 $ 1.61 $ 2.28 Diluted earnings per share $ 0.46 $ 0.81 $ 1.55 $ 2.18

Billed and Unbilled Receivabl_2

Billed and Unbilled Receivables (Tables)	9 Months Ended
	Sep. 28, 2019
Receivables [Abstract]
Schedule of accounts, notes, loans and financing receivable	Billed and Unbilled Receivables consists of the following: September 28, 2019 December 29, 2018 Billed receivables $ 114,148 $ 101,482 Less: allowance for doubtful accounts (4,557 ) (3,158 ) Billed receivables, net $ 109,590 $ 98,324 Unbilled receivables $ 55,206 $ 44,799 Less: allowance for doubtful accounts (1,388 ) (1,388 ) Unbilled receivables, net $ 53,818 $ 43,411

Property and Equipment, net (Ta

Property and Equipment, net (Tables)	9 Months Ended
	Sep. 28, 2019
Property, Plant and Equipment [Abstract]
Property, plant and equipment	Property and equipment, net, consists of the following: September 28, 2019 December 29, 2018 Office furniture and equipment $ 2,877 $ 2,328 Computer equipment 12,382 11,640 Survey and field equipment 6,388 5,526 Leasehold improvements 3,981 2,541 25,628 22,035 Accumulated depreciation (13,279 ) (10,358 ) $ 12,349 $ 11,677

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 28, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of goodwill	The changes in the carrying value by reportable segment for the nine months ended September 28, 2019 were as follows: Nine Months Ended December 29, 2018 2019 Acquisitions Disposed/Adjustments September 28, 2019 INF $ 69,255 $ 13,797 $ (2,193 ) $ 80,859 BTS 71,675 5,889 — 77,564 Total $ 140,930 $ 19,686 $ (2,193 ) $ 158,423
Schedule of finite-lived intangible assets	Intangible assets, net, as of September 28, 2019 and December 29, 2018 consist of the following: September 28, 2019 December 29, 2018 Gross Carrying Amount Accumulated Amortization Net Amount Gross Carrying Amount Accumulated Amortization Net Amount Customer relationships (1) $ 113,794 $ (26,434 ) $ 87,360 $ 100,956 $ (18,724 ) $ 82,232 Trade name (2) 9,798 (8,084 ) 1,714 8,888 (6,469 ) 2,419 Customer backlog (1) 16,853 (10,966 ) 5,887 16,000 (6,730 ) 9,270 Favorable lease (3) 553 (233 ) 320 552 (197 ) 355 Non-compete (4) 10,201 (4,794 ) 5,407 8,554 (3,074 ) 5,480 Total $ 151,199 $ (50,511 ) $ 100,688 $ 134,950 $ (35,194 ) $ 99,756 (1) Amortized on a straight-line basis over estimated lives ( 1 to 10 years ) (2) Amortized on a straight-line basis over their estimated lives ( 1 to 3 years ) (3) Amortized on a straight-line basis over the remaining lease term of 9 years (4) Amortized on a straight-line basis over their contractual lives ( 4 to 5 years )

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	9 Months Ended
	Sep. 28, 2019
Payables and Accruals [Abstract]
Schedule of accrued liabilities	Accrued liabilities consist of the following: September 28, 2019 December 29, 2018 Accrued lease liability $ 10,768 $ — Accrued vacation 9,958 7,994 Payroll and related taxes 5,383 8,136 Benefits 1,708 1,598 Unrecognized tax benefits 878 548 Professional liability reserve 1,168 157 Deferred rent — 779 Other 3,791 1,641 Total $ 33,654 $ 20,853

Notes Payable and Other Oblig_2

Notes Payable and Other Obligations (Tables)	9 Months Ended
	Sep. 28, 2019
Payables and Accruals [Abstract]
Schedule of long-term debt instruments	Notes payable and other obligations consists of the following: September 28, 2019 December 29, 2018 Other obligations $ 3,774 $ 4,893 Uncollateralized promissory notes 41,765 40,001 Senior credit facility 10,000 — Capital leases 2,676 2,092 Total notes payable and other obligations 58,215 46,986 Current portion of notes payable and other obligations (17,578 ) (17,139 ) Notes payable and other obligations, less current portion 40,638 29,847

Contingent Consideration (Table

Contingent Consideration (Tables)	9 Months Ended
	Sep. 28, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of business acquisitions by acquisition, contingent consideration	The following table summarizes the changes in the carrying value of estimated contingent consideration: September 28, 2019 December 29, 2018 Contingent consideration, beginning of the year $ 4,698 $ 1,890 Additions for acquisitions 2,737 3,112 Reduction of liability for payments made (1,938 ) (728 ) Increase of liability related to re-measurement of fair value 49 424 Total contingent consideration, end of the period 5,546 4,698 Current portion of contingent consideration (3,351 ) (1,845 ) Contingent consideration, less current portion $ 2,195 $ 2,853

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 28, 2019
Share-based Payment Arrangement [Abstract]
Share-based payment arrangement, restricted stock unit, activity	The following summarizes the activity of restricted stock awards during the nine months ended September 28, 2019 : Number of Unvested Restricted Shares of Common Stock and Restricted Stock Units Weighted Average Grant Date Fair Value December 29, 2018 626,911 $ 39.81 Granted 248,694 $ 72.98 Vested (204,655) $ 20.24 Forfeited (35,263) $ 51.84 September 28, 2019 635,687 $ 58.42

Reportable Segments (Tables)

Reportable Segments (Tables)	9 Months Ended
	Sep. 28, 2019
Segment Reporting [Abstract]
Schedule of segment reporting information, by segment	The following tables set forth summarized financial information concerning our reportable segments: Three Months Ended Nine Months Ended September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 Gross revenues INF $ 89,035 $ 64,053 $ 250,354 $ 180,611 BTS 43,060 41,441 128,706 125,344 Elimination of inter- segment revenues (1,063 ) (1,309 ) (2,720 ) (3,218 ) Total gross revenues $ 131,032 $ 104,185 $ 376,340 $ 302,737 Segment income before taxes INF $ 14,008 $ 11,108 $ 41,273 $ 28,951 BTS 6,871 7,236 20,287 21,069 Total Segment income before taxes 20,879 18,344 61,560 50,020 Corporate (1) (13,476 ) (8,821 ) (37,958 ) (26,107 ) Total income before taxes $ 7,403 $ 9,523 $ 23,602 $ 23,913 (1) Includes amortization of intangibles of $ 5,234 and 15,317 for the three and nine months ended September 28, 2019 , respectively and $2,980 and $8,549 for the three and nine months ended September 29, 2018 , respectively.
Schedule of revenue from external customers by geographic areas	We believe this best depicts how the nature, amount, timing and uncertainty of our revenues and cash flows are affected by economic factors. Three Months Ended September 28, 2019 Nine Months Ended September 28, 2019 INF BTS Total INF BTS Total Gross revenues by Geographic Location United States $ 87,572 $ 41,872 $ 129,444 $ 247,634 $ 121,829 $ 369,463 Foreign — 1,588 1,588 — 6,877 6,877 Total gross revenues $ 87,572 $ 43,460 $ 131,032 $ 247,634 $ 128,706 $ 376,340 Three Months Ended September 29, 2018 Nine Months Ended September 29, 2018 INF BTS Total INF BTS Total Gross revenues by Geographic Location United States $ 63,514 $ 38,678 $ 102,192 $ 178,531 $ 115,371 $ 293,902 Foreign — 1,993 1,993 — 8,835 8,835 Total gross revenues $ 63,514 $ 40,671 $ 104,185 $ 178,531 $ 124,206 $ 302,737
Schedule of revenue by major customers by reporting segments	Three Months Ended September 28, 2019 Nine Months Ended September 28, 2019 INF BTS Total INF BTS Total Gross revenues by Customer Public and quasi-public sector $ 69,297 $ 17,899 $ 87,196 $ 209,837 $ 50,471 $ 260,308 Private sector 18,275 25,561 43,836 37,797 78,235 116,032 Total gross revenues $ 87,572 $ 43,460 $ 131,032 $ 247,634 $ 128,706 $ 376,340 Three Months Ended September 29, 2018 Nine Months Ended September 29, 2018 INF BTS Total INF BTS Total Gross revenues by Customer Public and quasi-public sector $ 58,157 $ 15,469 $ 73,626 $ 162,193 $ 49,519 $ 211,712 Private sector 5,357 25,202 30,559 16,338 74,687 91,025 Total gross revenues $ 63,514 $ 40,671 $ 104,185 $ 178,531 $ 124,206 $ 302,737
Schedule of revenue from external customers by products and services	Three Months Ended September 28, 2019 Nine Months Ended September 28, 2019 INF BTS Total INF BTS Total Gross revenues by Contract Type Cost-reimbursable contracts $ 84,426 $ 31,797 $ 116,223 $ 240,166 $ 99,935 $ 340,101 Fixed-unit price contracts 3,146 11,663 14,809 7,468 28,771 36,239 Total gross revenues $ 87,572 $ 43,460 $ 131,032 $ 247,634 $ 128,706 $ 376,340 Three Months Ended September 29, 2018 Nine Months Ended September 29, 2018 INF BTS Total INF BTS Total Gross revenues by Contract Type Cost-reimbursable contracts $ 63,507 $ 32,196 $ 95,703 $ 178,255 $ 98,756 $ 277,011 Fixed-unit price contracts 7 8,475 8,482 276 25,450 25,726 Total gross revenues $ 63,514 $ 40,671 $ 104,185 $ 178,531 $ 124,206 $ 302,737

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 28, 2019
Leases [Abstract]
Schedule of supplemental balance sheet information	Leases Classification September 28, 2019 Assets Operating lease assets Right-of-use lease asset, net (1) $ 42,366 Finance lease assets Property and equipment, net (1) 2,311 Total leased assets $ 44,677 Liabilities Current Operating Accrued liabilities $ 10,768 Finance Current portion of notes payable and other obligations 896 Noncurrent Operating Long-term lease liability 32,781 Finance Notes payable and other obligations, less current portion 1,780 Total lease liabilities $ 46,225 (1): At September 28, 2019 , operating right of-use lease assets and finance lease assets are recorded net of accumulated amortization of $6,770 and $1,365 , respectively.
Schedule of lease cost	Three Months Ended Nine Months Ended Lease Cost Classification September 28, 2019 September 28, 2019 Operating lease cost Facilities and facilities related $ 2,995 $ 8,237 Finance lease cost Amortization of financing lease assets Depreciation and amortization 193 517 Interest on lease liabilities Interest expense 26 71 Total lease cost $ 3,214 $ 8,825
Schedule of maturities of lease liabilities	Maturity of Lease Liabilities Operating Leases Finance Leases 2019 $ 3,257 $ 234 2020 11,742 975 2021 10,079 874 2022 7,325 611 2023 5,934 353 Thereafter 9,965 103 Total lease payments 48,302 3,150 Less: Interest 4,753 474 Present value of lease liabilities $ 43,549 $ 2,676
Schedule of maturities of lease liabilities	Maturity of Lease Liabilities Operating Leases Finance Leases 2019 $ 3,257 $ 234 2020 11,742 975 2021 10,079 874 2022 7,325 611 2023 5,934 353 Thereafter 9,965 103 Total lease payments 48,302 3,150 Less: Interest 4,753 474 Present value of lease liabilities $ 43,549 $ 2,676
Schedule of lease term and discount rate	Weighted - Average Remaining Lease Term (Years) September 28, 2019 Operating leases 5.3 Finance leases 2.7 Weighted - Average Discount Rate Operating leases 4% Finance leases 7%
Schedule of supplemental cash flow information	Nine Months Ended Supplemental Cash Flow Information September 28, 2019 Operating cash flows from operating leases $ 7,833 Financing cash flows from finance leases $ 543 Right-of-use assets obtained in exchange for lease obligations Operating leases $ 14,251
Schedule of future minimum rental payments for operating leases	Future minimum payments under non-cancelable operating leases as of December 29, 2018 were as follows: Years Ended Amount 2019 $ 9,506 2020 8,054 2021 7,224 2022 5,364 2023 4,504 Thereafter 7,704 Total minimum lease payments $ 42,356

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 30, 2018
Leases
Total lease assets	$ 44,677
Total lease liabilities	$ 46,225
Accounting Standards Update 2016-02
Leases
Total lease assets		$ 34,186
Total lease liabilities		$ 34,965

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Accounting Policies [Abstract]
Remaining revenue performance obligation amount	$ 504,349		$ 504,349
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with customer, liability, revenue recognized	$ 2	$ 222	$ 6,437	$ 434
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-28
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation expected timing of satisfaction	24 months		24 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-29
Accounting Policies [Abstract]
Remaining revenue performance obligation amount	$ 390,454		$ 390,454
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation expected timing of satisfaction	12 months		12 months

Earnings Per Share - Schedule

Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Earnings Per Share [Abstract]
Net income – basic and diluted	$ 5,843	$ 7,285	$ 20,180	$ 19,197
Basic weighted average shares outstanding	12,191,405	11,256,946	12,086,588	10,686,040
Effect of dilutive non-vested restricted shares and units	308,240	381,250	325,219	396,577
Effect of issuable shares related to acquisitions	67,321	63,198	73,242	88,594
Effect of warrants	0	0	0	34,537
Diluted weighted average shares outstanding	12,566,966	11,701,394	12,485,049	11,205,748

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 21, 2018	Mar. 19, 2018	Mar. 23, 2013	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Mar. 26, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Non-vested restricted shares				0	0	0	0
Proceeds from exercise of unit warrant						$ 0	$ 1,092
Exercise price per warrant unit (in usd per share)								$ 7.80
Restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Non-vested restricted shares						625,687	588,430
Unit warrant | Underwriter
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrant units (in shares)								140,000
Proceeds from exercise of unit warrant		$ 1,092	$ 1,008
Proceeds from exercise of warrants, net of costs (in shares)	140,000
Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Proceeds from exercise of warrants, net of costs (in shares)							140,000
Common Stock | Unit warrant | Underwriter
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of securities called by each warrant unit (in shares)								1
Warrant | Unit warrant | Underwriter
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of securities called by each warrant unit (in shares)								1

Business Acquisitions - Narrat

Business Acquisitions - Narrative (Details) $ in Thousands	Jul. 02, 2019USD ($)	Jul. 01, 2019USD ($)installmentsshares	Jun. 03, 2019USD ($)installmentsshares	Mar. 22, 2019USD ($)installments	Dec. 31, 2018USD ($)installmentsshares	Nov. 02, 2018USD ($)installmentsshares	Aug. 24, 2018USD ($)installmentsshares	Feb. 02, 2018USD ($)installmentsshares	Jan. 12, 2018USD ($)installmentsshares	Jul. 31, 2019USD ($)	Sep. 28, 2019USD ($)	Sep. 29, 2018USD ($)	Dec. 29, 2018USD ($)	Dec. 30, 2017USD ($)
Business Acquisition [Line Items]
Total consideration											$ 45,468		$ 93,628
Payments to acquire businesses											1,213	$ 728
Promissory note incurred											2,570		3,112
Working capital adjustment reduction of purchase price										$ 2,360
Earn-out of cash fair value											5,546		4,698	$ 1,890
WHPacific, Inc.
Business Acquisition [Line Items]
Total consideration	$ 9,000
GeoDesign, Inc.
Business Acquisition [Line Items]
Total consideration		$ 12,800
Payments to acquire businesses		8,500
Consideration transferred of common stock		$ 375
Common stock number of shares | shares		4,731
Common stock purchase price		$ 425
Earn-out of cash		1,500
Earn-out of cash fair value		1,456
GeoDesign, Inc. | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable		$ 2,000
Promissory note interest rate		4.00%
Number of installments | installments		4	4
Alta Environmental, L.P.
Business Acquisition [Line Items]
Total consideration			$ 6,500
Payments to acquire businesses			4,000
Earn-out of cash			500
Earn-out of cash fair value			485
Alta Environmental, L.P. | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable			$ 2,000
Promissory note interest rate			4.00%
Number of installments | installments			4
Periodic payment		$ 500	$ 500
Page One Consultants
Business Acquisition [Line Items]
Total consideration			3,900
Payments to acquire businesses			2,000
Consideration transferred of common stock			$ 200
Common stock number of shares | shares			2,647
Common stock purchase price			$ 200
Earn-out of cash			500
Earn-out of cash fair value			448
Page One Consultants | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable											1,000
Promissory note incurred			$ 1,000
Promissory note interest rate			3.00%
Number of installments | installments			3
Periodic payment			$ 333
Acquisition of The Sextant Group
Business Acquisition [Line Items]
Total consideration				$ 11,000
Payments to acquire businesses				7,000
Acquisition of The Sextant Group | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable											4,000
Promissory note incurred				$ 4,000
Promissory note interest rate				4.00%
Number of installments | installments				4
Periodic payment				$ 1,000
Celtic Energy, Inc
Business Acquisition [Line Items]
Total consideration					$ 1,900
Payments to acquire businesses					1,000
Consideration transferred of common stock					$ 200
Common stock number of shares | shares					3,227
Common stock purchase price					$ 200
Earn-out of cash					200
Earn-out of cash fair value					181
Celtic Energy, Inc | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable											300
Promissory note incurred					$ 300
Promissory note interest rate					3.00%
Number of installments | installments					3
Periodic payment					$ 100
CHI Engineering Inc.
Business Acquisition [Line Items]
Payments to acquire businesses						$ 30,000
Consideration transferred of common stock						$ 3,000
Common stock number of shares | shares						36,729
Common stock purchase price						$ 3,000
Earn-out of cash						2,000
Earn-out of cash fair value						$ 1,547
Number of equal installments | installments						3
Periodic payments						$ 1,000
Liability interest rate						3.00%
CHI Engineering Inc. | Maximum
Business Acquisition [Line Items]
Total consideration						$ 53,000
CHI Engineering Inc. | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable											15,000		15,000
Promissory note incurred						$ 15,000
Promissory note interest rate						3.00%
Number of installments | installments						4
Periodic payment						$ 3,750
CALYX Engineers and Consultants Inc.
Business Acquisition [Line Items]
Total consideration							$ 34,000
Payments to acquire businesses							25,000
Consideration transferred of common stock							$ 3,000
Common stock number of shares | shares							36,379
CALYX Engineers and Consultants Inc. | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable											3,000		4,000
Promissory note incurred							$ 4,000
Promissory note interest rate							3.75%
Number of installments | installments							4
Periodic payment							$ 1,000
CALYX Engineers and Consultants Inc. | Cash Payable Within 120 Days
Business Acquisition [Line Items]
Promissory note incurred							$ 2,000
CSA (M&E) Ltd.
Business Acquisition [Line Items]
Total consideration								$ 4,200
Payments to acquire businesses								2,000
Consideration transferred of common stock								$ 150
Common stock number of shares | shares								2,993
Common stock purchase price								$ 250
Earn-out of cash								1,200
Earn-out of cash fair value								$ 899
Number of equal installments | installments								2
Periodic payments								$ 125
CSA (M&E) Ltd. | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable											450		600
Promissory note incurred								$ 600
Promissory note interest rate								3.00%
Number of installments | installments								4
Periodic payment								$ 150
Butsko Utility Design, Inc.
Business Acquisition [Line Items]
Total consideration									$ 4,250
Payments to acquire businesses									1,500
Consideration transferred of common stock									$ 300
Common stock number of shares | shares									5,630
Common stock purchase price									$ 600
Earn-out of cash									850
Earn-out of cash fair value									$ 666
Number of equal installments | installments									2
Periodic payments									$ 300
Butsko Utility Design, Inc. | Uncollateralized promissory notes
Business Acquisition [Line Items]
Notes Payable											$ 750		$ 1,000
Promissory note incurred									$ 1,000
Promissory note interest rate									3.00%
Number of installments | installments									4
Periodic payment									$ 250

Business Acquisitions - Summar

Business Acquisitions - Summary of the fair values of assets acquired and liabilities assumed (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 28, 2019	Dec. 29, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Cash	$ 75	$ 345
Billed and unbilled receivables, net	19,417	20,999
Property and equipment	1,580	3,122
Prepaid expenses	2,056	589
Other assets	164	83
Total Assets	39,540	72,197
Liabilities	(9,263)	(11,589)
Deferred tax liabilities	(4,495)	(8,903)
Net assets acquired	25,782	51,705
Consideration paid (Cash, Notes and/or stock)	42,898	90,516
Contingent earn-out liability (Cash and stock)	2,570	3,112
Total Consideration	45,468	93,628
Excess consideration over the amounts assigned to the net assets acquired (Goodwill)	19,686	41,923
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets:	12,839	32,267
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets:	910	2,479
Customer backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets:	852	8,007
Non-compete
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets:	$ 1,647	$ 4,306

Business Acquisitions - Result

Business Acquisitions - Results of operations from any business acquired (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Business Combinations [Abstract]
Gross Revenues	$ 16,537	$ 4,984	$ 22,229	$ 11,374
Income before income taxes	$ 1,272	$ 1,356	$ 2,211	$ 2,008

Business Acquisitions - Pro fo

Business Acquisitions - Pro forma consolidated results of operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Business Combinations [Abstract]
Gross revenues	$ 131,032	$ 141,249	$ 403,162	$ 417,672
Net income	$ 5,843	$ 9,526	$ 19,407	$ 24,550
Basic earnings per share	$ 0.48	$ 0.84	$ 1.61	$ 2.28
Diluted earnings per share	$ 0.46	$ 0.81	$ 1.55	$ 2.18

Billed and Unbilled Receivabl_3

Billed and Unbilled Receivables (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Receivables [Abstract]
Billed receivables	$ 114,148	$ 101,482
Less: allowance for doubtful accounts	(4,557)	(3,158)
Billed receivables, net	109,590	98,324
Unbilled receivables	55,206	44,799
Less: allowance for doubtful accounts	(1,388)	(1,388)
Unbilled receivables, net	$ 53,818	$ 43,411

Property and Equipment, net -

Property and Equipment, net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 1,317	$ 1,077	$ 3,591	$ 3,111

Property and Equipment, net (De

Property and Equipment, net (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 25,628	$ 22,035
Accumulated depreciation	(13,279)	(10,358)
Property and equipment, net	12,349	11,677
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,877	2,328
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,382	11,640
Survey and field equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,388	5,526
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,981	$ 2,541

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 28, 2019USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 140,930
2019 Acquisitions	19,686
Disposed/Adjustments	(2,193)
Ending balance	158,423
INF
Goodwill [Roll Forward]
Beginning balance	69,255
2019 Acquisitions	13,797
Disposed/Adjustments	(2,193)
Ending balance	80,859
BTS
Goodwill [Roll Forward]
Beginning balance	71,675
2019 Acquisitions	5,889
Disposed/Adjustments	0
Ending balance	$ 77,564

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 151,199	$ 134,950
Accumulated Amortization	(50,511)	(35,194)
Net Amount	100,688	99,756
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	113,794	100,956
Accumulated Amortization	(26,434)	(18,724)
Net Amount	$ 87,360	82,232
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	1 year
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 9,798	8,888
Accumulated Amortization	(8,084)	(6,469)
Net Amount	$ 1,714	2,419
Trade name | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	1 year
Trade name | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Customer backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,853	16,000
Accumulated Amortization	(10,966)	(6,730)
Net Amount	5,887	9,270
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	553	552
Accumulated Amortization	(233)	(197)
Net Amount	$ 320	355
Useful life	9 years
Non-compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,201	8,554
Accumulated Amortization	(4,794)	(3,074)
Net Amount	$ 5,407	$ 5,480
Non-compete | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	4 years
Non-compete | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill		$ 5,712	$ 13,549	$ 5,712	$ 13,549
Working capital adjustment reduction of purchase price	$ 2,360
Amortization expense		$ 5,234	$ 2,980	$ 15,317	$ 8,549

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Payables and Accruals [Abstract]
Accrued lease liability	$ 10,768	$ 0
Accrued vacation	9,958	7,994
Payroll and related taxes	5,383	8,136
Benefits	1,708	1,598
Unrecognized tax benefits	878	548
Professional liability reserve	1,168	157
Deferred rent		779
Other	3,791	1,641
Total	$ 33,654	$ 20,853

Notes Payable and Other Oblig_3

Notes Payable and Other Obligations - Summary of notes payable and other obligations (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 28, 2019	Dec. 29, 2018
Debt Instrument [Line Items]
Notes payable and other obligations	$ 58,215	$ 46,986
Senior credit facility	10,000	0
Current portion of notes payable and other obligations	(17,578)	(17,139)
Notes payable and other obligations, less current portion	40,638	29,847
Other obligations
Debt Instrument [Line Items]
Notes payable and other obligations	3,774	4,893
Uncollateralized promissory notes
Debt Instrument [Line Items]
Notes payable and other obligations	41,765	40,001
Capital leases
Debt Instrument [Line Items]
Notes payable and other obligations	$ 2,676	$ 2,092

Notes Payable and Other Oblig_4

Notes Payable and Other Obligations - Narrative (Details)

Jul. 01, 2019USD ($)installments

Jun. 03, 2019USD ($)installments

Mar. 22, 2019USD ($)installments

Dec. 31, 2018USD ($)installments

Dec. 20, 2018USD ($)

Nov. 02, 2018USD ($)installments

Aug. 24, 2018USD ($)installments

Feb. 02, 2018USD ($)installments

Jan. 12, 2018USD ($)installments

Sep. 06, 2017USD ($)installments

Jun. 06, 2017USD ($)installments

May 04, 2017USD ($)installments

May 01, 2017USD ($)installments

Dec. 06, 2016USD ($)installments

Nov. 30, 2016USD ($)installments

Oct. 26, 2016USD ($)installments

Sep. 12, 2016USD ($)installments

May 20, 2016USD ($)installments

Jul. 01, 2015USD ($)installments

Jan. 30, 2015USD ($)installments

Sep. 28, 2019USD ($)

Dec. 29, 2018USD ($)

Debt Instrument [Line Items]

Senior credit facility

$ 10,000,000

$ 0

Contingent earn-out liability (Cash and stock)

2,570,000

3,112,000

GeoDesign, Inc.

Debt Instrument [Line Items]

Purchase price

$ 425,000

Outstanding balance

382,000

Page One Consultants

Debt Instrument [Line Items]

Purchase price

$ 200,000

Outstanding balance

181,000

Celtic Energy, Inc

Debt Instrument [Line Items]

Purchase price

$ 200,000

Outstanding balance

181,000

CHI Engineering Inc.

Debt Instrument [Line Items]

Purchase price

$ 3,000,000

Number of equal installments | installments

3

Outstanding balance

2,631,000

2,631,000

CSA (M&E) Ltd.

Debt Instrument [Line Items]

Purchase price

$ 250,000

Number of equal installments | installments

2

Outstanding balance

111,000

222,000

Butsko Utility Design, Inc.

Debt Instrument [Line Items]

Purchase price

$ 600,000

Number of equal installments | installments

2

Outstanding balance

267,000

534,000

Marron and Associates, Inc.

Debt Instrument [Line Items]

Purchase price

$ 133,000

Number of equal installments | installments

2

Outstanding balance

55,000

Richard D. Kimball Co., Inc.

Debt Instrument [Line Items]

Purchase price

$ 1,333,000

Number of equal installments | installments

2

Outstanding balance

2,750,000

504,000

Dade Moeller

Debt Instrument [Line Items]

Purchase price

$ 3,000,000

Number of equal installments | installments

3

Outstanding balance

936,000

Periodic payments

$ 1,000,000

Uncollateralized promissory notes | GeoDesign, Inc.

Debt Instrument [Line Items]

Promissory note interest rate

4.00%

Number of installments | installments

4

4

Notes payable outstanding balance

$ 2,000,000

Uncollateralized promissory notes | Page One Consultants

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 1,000,000

Promissory note interest rate

3.00%

Number of installments | installments

3

Notes payable outstanding balance

1,000,000

Uncollateralized promissory notes | Celtic Energy, Inc

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 300,000

Promissory note interest rate

3.00%

Number of installments | installments

3

Notes payable outstanding balance

300,000

Uncollateralized promissory notes | CHI Engineering Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 15,000,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

15,000,000

15,000,000

Uncollateralized promissory notes | CSA (M&E) Ltd.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 600,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

450,000

600,000

Uncollateralized promissory notes | Butsko Utility Design, Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 1,000,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

750,000

1,000,000

Uncollateralized promissory notes | Marron and Associates, Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 300,000

Promissory note interest rate

3.00%

Number of installments | installments

3

Notes payable outstanding balance

100,000

200,000

Uncollateralized promissory notes | Richard D. Kimball Co., Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 5,500,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

0

4,125,000

Uncollateralized promissory notes | Dade Moeller

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 6,000,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

1,497,000

3,036,000

Uncollateralized promissory notes | Alta Environmental, L.P.

Debt Instrument [Line Items]

Promissory note interest rate

4.00%

Number of installments | installments

4

Notes payable outstanding balance

$ 2,000,000

Uncollateralized promissory notes | Acquisition of The Sextant Group

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 4,000,000

Promissory note interest rate

4.00%

Number of installments | installments

4

Notes payable outstanding balance

4,000,000

Uncollateralized promissory notes | CALYX Engineers and Consultants Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 4,000,000

Promissory note interest rate

3.75%

Number of installments | installments

4

Notes payable outstanding balance

3,000,000

4,000,000

Uncollateralized promissory notes | Holdrege & Kull, Consulting Engineers and Geologists

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 600,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

300,000

450,000

Uncollateralized promissory notes | Lochrane Engineering, Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 1,650,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

825,000

1,238,000

Uncollateralized promissory notes | CivilSource, Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 3,500,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

1,606,000

2,625,000

Uncollateralized promissory notes | The Hanna Group, Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 2,700,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

1,350,000

1,350,000

Uncollateralized promissory notes | JBA Consulting Engineers, Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 7,000,000

Promissory note interest rate

3.00%

Number of installments | installments

5

Notes payable outstanding balance

4,200,000

4,200,000

Uncollateralized promissory notes | Weir Environmental LLC

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 500,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

125,000

250,000

Uncollateralized promissory notes | RBA Group Inc.

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 4,000,000

Promissory note interest rate

3.00%

Number of installments | installments

4

Notes payable outstanding balance

1,000,000

Uncollateralized promissory notes | Joslin Lesser and Associates

Debt Instrument [Line Items]

Contingent earn-out liability (Cash and stock)

$ 1,250,000

Promissory note interest rate

3.50%

Number of installments | installments

4

Notes payable outstanding balance

313,000

Bank of America, N.A. | Senior Credit Facility | Revolving Credit Facility

Debt Instrument [Line Items]

Senior credit facility expiration period

5 years

Senior credit facility maximum borrowing capacity

$ 125,000,000

$ 125,000,000

Senior credit facility additional maximum borrowing capacity

$ 100,000,000

Senior credit facility maximum leverage ratio

4

Senior credit facility minimum fixed charge coverage ratio

1.20

Senior credit facility total

$ 0

Bank of America, N.A. | Senior Credit Facility | Standby Letters of Credit

Debt Instrument [Line Items]

Senior credit facility maximum borrowing capacity

$ 20,000,000

Bank of America, N.A. | Senior Credit Facility | Swingline Loans

Debt Instrument [Line Items]

Senior credit facility maximum borrowing capacity

$ 15,000,000

Contingent Consideration (Detai

Contingent Consideration (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 28, 2019	Dec. 29, 2018
Commitments and Contingencies Disclosure [Roll Forward]
Contingent consideration, beginning of the year	$ 4,698	$ 1,890
Additions for acquisitions	2,737	3,112
Reduction of liability for payments made	(1,938)	(728)
Increase of liability related to re-measurement of fair value	49	424
Total contingent consideration, end of the period	5,546	4,698
Current portion of contingent consideration	(3,351)	(1,845)
Contingent consideration, less current portion	$ 2,195	$ 2,853

Stock-Based Compensation - Res

Stock-Based Compensation - Restricted Stock Awards (Details) - Restricted Stock	9 Months Ended
	Sep. 28, 2019$ / sharesshares
Number of Unvested Restricted Shares of Common Stock and Restricted Stock Units
Beginning (in shares) | shares	626,911
Granted (in shares) | shares	248,694
Vested (in shares) | shares	(204,655)
Forfeited (in shares) | shares	(35,263)
Ending (in shares) | shares	635,687
Weighted Average Grant Date Fair Value
Beginning (in dollars per share) | $ / shares	$ 39.81
Granted (in dollars per share) | $ / shares	72.98
Vested (in dollars per share) | $ / shares	20.24
Forfeited (in dollars per share) | $ / shares	51.84
Ending (in dollars per share) | $ / shares	$ 58.42

Stock-Based Compensation - Nar

Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation	$ 2,822	$ 1,902	$ 6,989	$ 4,541
Weighted average vesting period	$ 19,867		$ 19,867
Cost not yet recognized, term			2 years 3 months 29 days
Fair value of restricted shares vested			$ 14,514	$ 7,422
Equity Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	1,256,403		1,256,403
Rate of increase decrease in shares authorized for issuance			3.50%
Minimum | Equity Plan 2011 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			2 years
Maximum | Equity Plan 2011 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Income Tax Disclosure [Abstract]
Deferred income tax liabilities, net	$ 16,881,000		$ 16,881,000		$ 16,224,000
Deferred tax asset, valuation allowance	$ 0		$ 0		0
Effective income tax rate percent	22.90%	24.50%	24.10%	24.80%
Income tax benefit related to the vesting of restricted stock	$ 121,000	$ 95,000	$ 2,593,000	$ 1,210,000
Unrecognized tax benefits	$ 878,000		$ 878,000		$ 548,000

Reportable Segments - Narrativ

Reportable Segments - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019USD ($)	Sep. 29, 2018USD ($)	Sep. 28, 2019USD ($)operating_segmentsreportable_segments	Sep. 29, 2018USD ($)
Segment Reporting [Abstract]
Number of operating segments | operating_segments			2
Number of reportable segments | reportable_segments			2
Amortization expense | $	$ 5,234	$ 2,980	$ 15,317	$ 8,549

Reportable Segments - Summarize

Reportable Segments - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 131,032	$ 104,185	$ 376,340	$ 302,737
Segment income before taxes	7,403	9,523	23,602	23,913
INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	87,572	63,514	247,634	178,531
BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	43,460	40,671	128,706	124,206
Operating Segments | INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	89,035	64,053	250,354	180,611
Segment income before taxes	14,008	11,108	41,273	28,951
Operating Segments | BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	43,060	41,441	128,706	125,344
Segment income before taxes	6,871	7,236	20,287	21,069
Elimination of inter- segment revenues
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	(1,063)	(1,309)	(2,720)	(3,218)
Segment income before taxes	20,879	18,344	61,560	50,020
Corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment income before taxes	$ (13,476)	$ (8,821)	$ (37,958)	$ (26,107)

Reportable Segments - Revenue

Reportable Segments - Revenue from contracts with customers by geographic location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	$ 131,032	$ 104,185	$ 376,340	$ 302,737
INF
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	87,572	63,514	247,634	178,531
BTS
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	43,460	40,671	128,706	124,206
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	129,444	102,192	369,463	293,902
United States | INF
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	87,572	63,514	247,634	178,531
United States | BTS
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	41,872	38,678	121,829	115,371
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	1,588	1,993	6,877	8,835
Foreign | INF
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	0	0	0	0
Foreign | BTS
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross revenues	$ 1,588	$ 1,993	$ 6,877	$ 8,835

Reportable Segments - Revenue b

Reportable Segments - Revenue by Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 131,032	$ 104,185	$ 376,340	$ 302,737
INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	87,572	63,514	247,634	178,531
BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	43,460	40,671	128,706	124,206
Public and quasi-public sector
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	87,196	73,626	260,308	211,712
Public and quasi-public sector | INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	69,297	58,157	209,837	162,193
Public and quasi-public sector | BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	17,899	15,469	50,471	49,519
Private sector
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	43,836	30,559	116,032	91,025
Private sector | INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	18,275	5,357	37,797	16,338
Private sector | BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 25,561	$ 25,202	$ 78,235	$ 74,687

Reportable Segments - Revenue_2

Reportable Segments - Revenue by Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 131,032	$ 104,185	$ 376,340	$ 302,737
INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	87,572	63,514	247,634	178,531
BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	43,460	40,671	128,706	124,206
Cost-reimbursable contracts
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	116,223	95,703	340,101	277,011
Cost-reimbursable contracts | INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	84,426	63,507	240,166	178,255
Cost-reimbursable contracts | BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	31,797	32,196	99,935	98,756
Fixed-unit price contracts
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	14,809	8,482	36,239	25,726
Fixed-unit price contracts | INF
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	3,146	7	7,468	276
Fixed-unit price contracts | BTS
Segment Reporting, Revenue Reconciling Item [Line Items]
Gross revenues	$ 11,663	$ 8,475	$ 28,771	$ 25,450

Leases - Schedule of supplement

Leases - Schedule of supplemental balance sheet information (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Assets
Operating lease assets	$ 42,366
Total leased assets	44,677
Current
Operating	10,768	$ 0
Noncurrent
Operating	32,781
Total lease liabilities	46,225
Operating right of-use lease assets	6,770
Financing right of-use lease assets	1,365
Right-of-use lease asset, net
Assets
Operating lease assets	42,366
Property and equipment, net
Assets
Finance lease assets	2,311
Accrued liabilities
Current
Operating	10,768
Current portion of notes payable and other obligations
Current
Finance	896
Long-term lease liability
Noncurrent
Operating	32,781
Notes payable and other obligations, less current portion
Noncurrent
Finance	$ 1,780

Leases - Schedule of lease cos

Leases - Schedule of lease cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 28, 2019	Sep. 28, 2019
Lessee, Lease, Description [Line Items]
Total lease cost	$ 3,214	$ 8,825
Facilities and facilities related
Lessee, Lease, Description [Line Items]
Operating lease cost	2,995	8,237
Depreciation and amortization
Lessee, Lease, Description [Line Items]
Amortization of financing lease assets	193	517
Interest expense
Lessee, Lease, Description [Line Items]
Interest on lease liabilities	$ 26	$ 71

Leases - Schedule of maturitie

Leases - Schedule of maturities of lease liabilities (Details) $ in Thousands	Sep. 28, 2019USD ($)
Operating Leases
2019	$ 3,257
2020	11,742
2021	10,079
2022	7,325
2023	5,934
Thereafter	9,965
Total lease payments	48,302
Less: Interest	4,753
Present value of lease liabilities	43,549
Present value of lease liabilities	2,676
Finance Leases
2019	234
2020	975
2021	874
2022	611
2023	353
Thereafter	103
Total lease payments	3,150
Less: Interest	$ 474

Leases - Schedule of lease ter

Leases - Schedule of lease term and discount rate (Details)	Sep. 28, 2019
Weighted - Average Remaining Lease Term (Years)
Operating leases	5 years 3 months 18 days
Finance leases	2 years 8 months 12 days
Weighted - Average Discount Rate
Operating leases	4.00%
Finance leases	7.00%

Leases - Schedule of supplemen

Leases - Schedule of supplemental cash flow information (Details) $ in Thousands	9 Months Ended
	Sep. 28, 2019USD ($)
Supplemental Cash Flow Information
Operating cash flows from operating leases	$ 7,833
Right-of-use assets obtained in exchange for lease obligations
Operating leases	14,251
Financing cash flows from finance leases	$ 543

Leases - Schedule of future mi

Leases - Schedule of future minimum rental payments for operating leases (Details) $ in Thousands	Dec. 29, 2018USD ($)
Leases [Abstract]
2019	$ 9,506
2020	8,054
2021	7,224
2022	5,364
2023	4,504
Thereafter	7,704
Total minimum lease payments	$ 42,356

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	Dec. 20, 2019	Sep. 28, 2019	Dec. 20, 2018
Forecast | Subsequent Event
Subsequent Event [Line Items]
Payments for merger related costs	$ 303,000,000
Bank of America, N.A. | Senior Credit Facility | Forecast | Subsequent Event
Subsequent Event [Line Items]
Senior credit facility maximum borrowing capacity	365,000,000
Bank of America, N.A. | Term loan tranche | Senior Credit Facility | Forecast | Subsequent Event
Subsequent Event [Line Items]
Line of credit facility change	150,000,000
Bank of America, N.A. | Revolving Credit Facility | Senior Credit Facility
Subsequent Event [Line Items]
Senior credit facility maximum borrowing capacity		$ 125,000,000	$ 125,000,000
Bank of America, N.A. | Revolving Credit Facility | Senior Credit Facility | Forecast | Subsequent Event
Subsequent Event [Line Items]
Line of credit facility change	$ 90,000,000