Hill International (HIL) 10-Q 7 May 20 2020 Q1 Quarterly report Financial data

COVER PAGE

COVER PAGE - shares	3 Months Ended
	Mar. 31, 2020	Apr. 24, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-33961
Entity Registrant Name	HILL INTERNATIONAL, INC.
Entity Central Index Key	0001287808
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-0953973
Entity Address, Address Line One	One Commerce Square
Entity Address, Address Line Two	2005 Market Street, 17th Floor
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19103
City Area Code	215
Local Phone Number	309-7700
Title of 12(b) Security	Common Stock, par value $0.0001
Trading Symbol	HIL
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		55,984,012

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 16,083	$ 15,915
Cash - restricted	3,489	4,666
Accounts receivable, net	108,109	103,892
Current portion of retainage receivable	16,040	16,459
Accounts receivable - affiliates	24,919	18,776
Prepaid expenses and other current assets	11,879	9,340
Income tax receivable	2,176	2,256
Total current assets	182,695	171,304
Property and equipment, net	10,167	11,895
Cash - restricted, net of current portion	3,921	4,401
Operating lease right-of-use assets	15,781	17,451
Retainage receivable	6,433	5,695
Acquired intangibles, net	205	232
Goodwill	44,591	48,024
Investments	1,628	1,711
Deferred income tax assets	3,074	3,800
Other assets	3,060	5,038
Total assets	271,555	269,551
Liabilities and Stockholders’ Equity
Current maturities of notes payable and long-term debt	3,071	1,792
Accounts payable and accrued expenses	66,394	65,172
Income taxes payable	3,586	3,152
Current portion of deferred revenue	9,090	10,773
Current portion of operating lease liabilities	5,481	5,736
Other current liabilities	6,065	4,876
Total current liabilities	93,687	91,501
Notes payable and long-term debt, net of current maturities	50,470	41,150
Retainage payable	1,581	1,551
Deferred income taxes	418	419
Deferred revenue	1,437	3,041
Non-current operating lease liabilities	15,850	17,030
Other liabilities	4,882	4,631
Total liabilities	168,325	159,323
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value; 1,000 shares authorized, none issued	0	0
Common stock, $0.0001 par value; 100,000 shares authorized, 62,530 shares and 62,708 shares issued at March 31, 2020 and December 31, 2019, respectively	6	6
Additional paid-in capital	213,263	212,759
Accumulated deficit	(77,941)	(71,360)
Accumulated other comprehensive loss	(3,913)	(3,817)
Less treasury stock of 6,807 and 6,546 at March 31, 2020 and December 31, 2019, respectively	(29,056)	(28,231)
Hill International, Inc. share of equity	102,359	109,357
Noncontrolling interests	871	871
Total equity	103,230	110,228
Total liabilities and stockholders’ equity	$ 271,555	$ 269,551

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	62,530,000	62,708,000
Treasury stock, shares	6,807,000	6,546,000

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total revenue	$ 93,308	$ 98,683
Direct expenses	65,048	67,247
Gross profit	28,260	31,436
Selling, general and administrative expenses	32,149	31,311
Plus: Share of profit of equity method affiliates	24	414
Operating (loss) profit	(3,865)	539
Interest and related financing fees, net	1,299	1,512
Other income, net	345	0
Loss before income taxes	(4,819)	(973)
Income tax expense	1,603	1,095
Net loss	(6,422)	(2,068)
Less: net earnings - non-controlling interests	159	67
Net loss attributable to Hill International, Inc.	$ (6,581)	$ (2,135)
Basic loss per common share - Hill International, Inc. (in dollars per share)	$ (0.12)	$ (0.04)
Basic weighted average common shares outstanding (in shares)	56,543	55,946
Diluted loss per common share - Hill International, Inc. (in dollars per share)	$ (0.12)	$ (0.04)
Diluted weighted average common shares outstanding (in shares)	56,543	55,946
Consulting fee revenue
Total revenue	$ 77,150	$ 79,000
Reimbursable expenses
Total revenue	$ 16,158	$ 19,683

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (6,422)	$ (2,068)
Foreign currency translation adjustment, net of tax	(255)	(1,854)
Comprehensive loss	(6,677)	(3,922)
Less: Comprehensive (loss) income attributable to non-controlling interests	0	19
Comprehensive loss attributable to Hill International, Inc.	$ (6,677)	$ (3,941)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Total	Hill Share of Stockholders' Equity	Common Stock	Additional Paid-in Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive (Loss)	Treasury Stock	Non-controlling Interests
Balance at beginning of period (in shares) at Dec. 31, 2018				62,181
Balance at beginning of period at Dec. 31, 2018		$ 94,445	$ 93,840	$ 6	$ 210,084	$ (85,444)	$ (2,575)	$ (28,231)	$ 605
Balance at beginning of period of treasury stock (in shares) at Dec. 31, 2018								6,546
Increase (decrease) in stockholders' equity
Net loss		(2,068)	(2,135)			(2,135)			67
Other comprehensive income (loss)		(1,854)	(1,806)				(1,806)		(48)
Stock issued to Board of Directors (in shares)				24
Stock issued to Board of Directors		0
Stock-based compensation expense		241	241		241
Balance at end of period (in shares) at Mar. 31, 2019				62,205
Balance at end of period at Mar. 31, 2019		$ 90,764	90,140	$ 6	210,325	(87,579)	(4,381)	$ (28,231)	624
Balance at end of period of treasury stock (in shares) at Mar. 31, 2019								6,546
Balance at beginning of period (in shares) at Dec. 31, 2019		62,708		62,708
Balance at beginning of period at Dec. 31, 2019		$ 110,228	109,357	$ 6	212,759	(71,360)	(3,817)	$ (28,231)	871
Balance at beginning of period of treasury stock (in shares) at Dec. 31, 2019		6,546						6,546
Increase (decrease) in stockholders' equity
Net loss		$ (6,422)	(6,581)			(6,581)			159
Other comprehensive income (loss)		(255)	(96)				(96)		(159)
Stock-based compensation expense		399	399		399
Stock issued under employee stock purchase plan (in shares)	[1]			83
Stock issued under employee stock purchase plan	[1]	105	105		105
Transfer of shares pledged as collateral (in shares)	[2]			261				261
Transfer of shares pledged as collateral	[2]	$ (825)	(825)					$ (825)
Balance at end of period (in shares) at Mar. 31, 2020		62,530		62,530
Balance at end of period at Mar. 31, 2020		$ 103,230	$ 102,359	$ 6	$ 213,263	$ (77,941)	$ (3,913)	$ (29,056)	$ 871
Balance at end of period of treasury stock (in shares) at Mar. 31, 2020		6,807						6,807
[1]	Includes $55 of proceeds related to shares issued under the Employee Stock Purchase Plan ("ESPP") during the three months ended March 31, 2020 and were received in the subsequent period. The three months ended March 31, 2019 excluded $34 of proceeds received during the period that are included in Hill International, Inc.'s (the "Company") consolidated statements of cash flow, but related to ESPP shares issued and recognized at December 31, 2018.
[2]	Reflects 261 of the Company's common stock pledged as collateral under the terms of a secured promissory note payable to the Company. During the three months ended March 31, 2020, the Company exercised its right to retain the shares upon the note holder's agreement to relinquish the shares upon the promissory note maturity date.

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Proceeds from employee stock purchase plan		$ 55	$ (34)
Treasury Stock
Transfer of shares pledged as collateral (in shares)	[1]	261
[1]	Reflects 261 of the Company's common stock pledged as collateral under the terms of a secured promissory note payable to the Company. During the three months ended March 31, 2020, the Company exercised its right to retain the shares upon the note holder's agreement to relinquish the shares upon the promissory note maturity date.

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss		$ (6,422)	$ (2,068)
Adjustments to reconcile net loss to net cash provided by (used in):
Depreciation and amortization		2,424	791
(Recovery) provision for bad debts		(479)	934
Amortization of deferred loan fees		175	179
Deferred tax expense (benefit)		490	(349)
Share-based compensation		399	241
Operating lease right-of-use assets		1,575	1,408
Foreign currency remeasurement losses (gains)		4,376	(511)
Changes in operating assets and liabilities:
Accounts receivable		(4,203)	5,390
Accounts receivable - affiliate		(6,143)	(218)
Prepaid expenses and other current assets		(2,608)	551
Income taxes receivable		(45)	(199)
Retainage receivable		(755)	(1,247)
Other assets		1,231	690
Accounts payable and accrued expenses		1,964	6,851
Income taxes payable		431	1,020
Deferred revenue		(2,994)	(3,423)
Operating lease liabilities		(1,323)	(1,442)
Other current liabilities		696	31
Retainage payable		29	51
Other liabilities		250	(222)
Net cash (used in) provided by continuing operations		(10,932)	8,458
Cash flows from investing activities:
Purchase of property and equipment		(833)	(873)
Net cash used in investing activities		(833)	(873)
Cash flows from financing activities:
Repayment of term loans		(217)	(266)
Proceeds from revolving loans		18,792	9,854
Repayment of revolving loans		(7,836)	(8,662)
Proceeds from stock issued under employee stock purchase plan		50	34
Net cash provided by financing activities		10,789	960
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(513)	(1,033)
Net (decrease) increase in cash, cash equivalents and restricted cash		(1,489)	7,512
Cash, cash equivalents and restricted cash — beginning of period		24,982	23,107
Cash, cash equivalents and restricted cash — end of period		23,493	30,619
Supplemental disclosures of cash flow information:
Interest and related financing fees paid		1,150	1,414
Income taxes paid		87	601
Cash paid for amounts included in the measurement of lease liabilities		1,910	1,814
Right-of-use assets obtained in exchange for operating lease liabilities	[1]	$ 0	$ 18,178
[1]	(1) Amount for the three months ended March 31, 2019 relates to the Company's January 1, 2019 adoption of Accounting Standards Update 2016-2, Leases (Topic 842).

The Company

The Company	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company	The Company Hill International, Inc. (“Hill” or the “Company”) is a professional services firm that provides program management, project management, construction management and other consulting services primarily to the buildings, transportation, environmental, energy and industrial markets worldwide. Hill’s clients include the U.S. federal government, U.S. state and local governments, foreign governments and the private sector. All amounts included in the following Notes to the Consolidated Financial Statements are in thousands, except per share data.

Liquidity

Liquidity	3 Months Ended
	Mar. 31, 2020
Liquidity [Abstract]
Liquidity	Liquidity At March 31, 2020 and December 31, 2019 , our principal sources of liquidity consisted of $16,083 and $15,915 of cash and cash equivalents, respectively, $1,500 and $9,052 of available borrowing capacity under the Domestic Revolving Credit Facility, respectively, $165 and $3,145 of available borrowing capacity under the International Revolving Credit Facility, respectively, and $1,134 and $2,538 under other foreign credit agreements, respectively. Additional information regarding the Company's credit facilities is set forth in Note 9 - Notes Payable and Long-Term Debt. In December 2019, COVID-19 was identified in Wuhan, China. In March 2020, the World Health Organization declared COVID-19 a global pandemic as a result of the further spread of the virus into all regions of the world, including those regions where the Company's primary operations occur. The effects of this global pandemic on the Company includes anticipated lower gross and operating margins, as well as temporary delays in accounts receivable collections. The Company is focused on preserving its principal sources of liquidity and managing its cash flow and will continue to evaluate the potential short-term and long-term implications of COVID-19 on its consolidated statements of operations. The Company has also implemented various actions and policies that is expected to result in approximately $10,000 in cost reductions. The Company believes that it has adequate liquidity and business plans to continue to operate the business and mitigate the risks associated with COVID-19 for the next 12 months from May 7, 2020

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Summary The accompanying unaudited interim consolidated financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") pertaining to reports on Form 10-Q and should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 . Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles ("U.S. GAAP") for complete financial statements. In the opinion of management, these statements include all adjustments (consisting only of normal, recurring adjustments) necessary for a fair presentation of the consolidated financial statements. The consolidated financial statements include the accounts of Hill and its wholly and majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The interim operating results are not necessarily indicative of the results for a full year. Reclassification A reclassification was made in the presentation of the consolidated statements of cash flow for the three months ended March 31, 2019 . Net borrowings on revolving loans previously reported as $1,192 was broken out between repayments of revolving loans and proceeds from revolving loans of $(8,662) and $9,854 , respectively, to conform to current year presentation. Certain back-office expenses and foreign currency translation gains and losses that had previously been included in the individual regions in the operating profit/(loss) table presentation are currently being included within the corporate costs line item on the operating profit/(loss) tables herein. The related 2019 prior period operating profit (loss) by geographic region and corporate costs have been recast to reflect this change. This change only affects the presentation in the operating profit/(loss) tables and has no impact on total operating profit/(loss) reported. The Company's Consolidated Statements of Operations for the three months ended March 31, 2019 reflects a change in the presentation of revenue. Total Revenue of $98,683 for the three months ended March 31, 2019 was broken out between consulting fee revenue ("CFR") and reimbursable expenses to conform to current year presentation. CFR is the revenue, excluding reimbursable costs. The Company believes that CFR is an important measure because it represents the revenue on which gross profit is earned. Other Income, net During the three months ended March 31, 2020, the Company recognized $345 of income in Other Income, net. The other income represents the cancellation of a PIDC Economic Stimulus Program Loan Agreement that the Company made on October 24, 2014 as a result of the Company satisfying all obligations in regard to the Loan Agreement. Summary of Significant Accounting Policies (a) Foreign Currency Translations and Transactions Assets and liabilities of all foreign operations are translated at period-end rates of exchange while revenues and expenses are translated at the average monthly exchange rates. Gains or losses resulting from translating foreign currency financial statements are accumulated in a separate component of stockholders’ equity titled accumulated other comprehensive loss until the entity is sold or substantially liquidated. Gains or losses arising from foreign currency transactions (transactions denominated in a currency other than the entity’s local currency), including those resulting from intercompany transactions, are reflected in selling, general and administrative expenses in the consolidated statements of operations. The impact of foreign exchange on long-term intercompany loans, for which repayment has not been scheduled or planned and permanent equity has been elected, are recorded in accumulated other comprehensive loss on the consolidated balance sheet. (b) Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash equivalents and accounts receivable. The Company maintains its cash accounts with high quality financial institutions. Although the Company believes that the financial institutions with which it does business will be able to fulfill their commitments, there is no assurance that those institutions will be able to continue to do so. No single client accounted for 10% or more of total revenue for the three months ended March 31, 2020 or 2019 . There was one client in Africa who contributed 10% or more to gross accounts receivable at March 31, 2020 and December 31, 2019 , respectively, which represents 15% and 17% of the gross accounts receivable balance at March 31, 2020 and December 31, 2019 , respectively. (c) Allowance for Doubtful Accounts The allowance for doubtful accounts is an estimate prepared by management based on identification of the collectability of specific accounts and the overall condition of the receivable portfolios. When evaluating the adequacy of the allowance for doubtful accounts, the Company specifically analyzes trade receivables, including retainage receivable, historical bad debts, client credits, client concentrations, current economic trends and changes in client payment terms. If the financial condition of clients were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. Likewise, should the Company determine that it would be able to realize more of its receivables in the future than previously estimated, an adjustment to the allowance would increase earnings in the period such determination was made. The allowance for doubtful accounts is reviewed on a quarterly basis and adjustments are recorded as deemed necessary. (d) Retainage Receivable Retainage receivable represents balances billed but not paid by clients pursuant to retainage provisions in certain contracts and will be due upon completion of specific tasks or the completion of the contract. (e) Income Taxes The Company estimates income taxes in each of the jurisdictions in which it operates. This process involves estimating its actual current tax exposure together with assessing temporary differences resulting from differing treatment of items for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the Company’s consolidated balance sheets. The Company assesses the likelihood that the deferred tax assets will be recovered from future taxable income and to the extent it believes recovery is not likely, the Company establishes a valuation allowance. To the extent the Company establishes a valuation allowance in a period, it must include an expense within the tax provision in the consolidated statements of operations. The Company has recorded a valuation allowance to reduce the deferred tax asset to an amount that is more likely than not to be realized in future years. If the Company determines in the future that it is “more likely than not” (i.e., a likelihood greater than 50 percent) to be allowed by the tax jurisdiction based solely on the technical merits of the position, that the deferred tax assets subject to the valuation allowance will be realized, then the previously provided valuation allowance will be adjusted. The Company recognizes a tax benefit in the financial statements for an uncertain tax position only if management’s assessment is that the position is more likely than not that the benefit will be ultimately realized. The term “tax position” refers to a position in a previously filed tax return or a position expected to be taken in a future tax return that is reflected in measuring current or deferred income tax assets and liabilities for interim or annual periods. (f) Revenue Recognition The Company generates revenue primarily from providing professional services to its clients under various types of contracts. In providing these services, the Company may incur reimbursable expenses, which consist principally of amounts paid to subcontractors and other third parties and travel and other job related expenses that are contractually reimbursable from clients. The Company includes reimbursable expenses in computing and reporting its total revenue as long as the Company remains responsible to the client for the fulfillment of the contract and for the overall acceptability of all services provided. If estimated total costs on any contract project a loss, the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses, and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated. These loss projects are re-assessed for each subsequent reporting period until the project is complete. Such revisions could occur at any time and the effects may be material. See Note 4 - Revenue from Contracts with Clients for more detail, regarding how the Company recognizes revenue under each type of its contractual arrangements. (g) Restricted Cash Restricted cash primarily represents cash collateral required to be maintained in foreign bank accounts to serve as collateral for letters of credit, bonds or guarantees on certain projects. The cash will remain restricted until the respective project has been completed, which typically is greater than one year. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the balance sheets that sum to the total of the same such amounts shown in the statements of cash flows: March 31, 2020 December 31, 2019 Cash and cash equivalents $ 16,083 $ 15,915 Cash - restricted 3,489 4,666 Cash - restricted, net of current portion 3,921 4,401 Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 23,493 $ 24,982 (h) Earnings (loss) per Share Basic earnings (loss) per common share have been computed using the weighted-average number of shares of common stock outstanding during the period. Diluted earnings (loss) per common share incorporates the incremental shares issuable upon the assumed exercise of stock options, the assumed vesting of stock and deferred and restricted stock unit awards using the treasury stock method, if dilutive. The Company has outstanding options to purchase approximately 1,616 shares and 1,417 shares at March 31, 2020 and 2019 , respectively. In addition, the Company had 789 and 471 restricted and deferred stock units outstanding at March 31, 2020 and 2019 , respectively. These awards were excluded from the calculation of diluted loss per share for the three months ended March 31, 2020 and 2019 because they were anti-dilutive. The following table provides a reconciliation to net loss used in the numerator for loss per share attributable to Hill: Three Months Ended March 31, 2020 2019 Net loss $ (6,422 ) $ (2,068 ) Less: net earnings - non-controlling interests 159 67 Net loss attributable to Hill International, Inc. $ (6,581 ) $ (2,135 ) Basic weighted average common shares outstanding 56,543 55,946 Effect of dilutive securities: Stock options — — Unvested share-based compensation units $ — $ — Diluted weighted average common shares outstanding 56,543 55,946 Basic and diluted net loss per share attributable to Hill $ (0.12 ) $ (0.04 ) (i) New Accounting Pronouncements Changes to U.S. GAAP are typically established by the Financial Accounting Standards Board (“FASB”) in the form of accounting standards updates (“ASUs”) to the FASB’s Accounting Standards Codification (“ASC”). The Company considers the applicability and impact of all ASUs and, based on its assessment, determined that any recently issued or proposed ASUs not listed below are either not applicable to the Company or adoption will have minimal impact on its consolidated financial statements. For additional information with respect to new accounting pronouncements and the impact of these pronouncements on our consolidated financial statements, see Note 3 to the consolidated financial statements in Item 8 of Form 10-K for the year ended December 31, 2019 filed with the SEC on March 26, 2020 . See update below. Recently Adopted Accounting Pronouncements In January 2017, the FASB issued ASU 2017-4, Intangibles - Goodwill and Other (Topic 350), which removes step 2 from the goodwill impairment test. As a result, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting units’ fair value. The guidance is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for annual or interim goodwill impairment tests performed on testing dates after January 1, 2017, and the prospective transition method should be applied. The Company adopted this guidance on January 1, 2020 and it did not materially impact its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this update. The amendments in this update are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption of the amendments in this update is permitted, including adoption in any interim period, for all entities. The amendments in this update should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company adopted this guidance on January 1, 2020 on a prospective basis and will begin to capitalize certain implementation costs that may have been previously expensed as incurred. There was no impact on the Company's consolidated financial statements on the date of implementation. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities ("VIE") . The amendments in this ASU for determining whether a decision-making fee is a variable interest require reporting entities to consider indirect interests held through related parties under common control on a proportional basis rather than as the equivalent of a direct interest in its entirety (as currently required by GAAP). These amendments will create alignment between determining whether a decision-making fee is a variable interest and determining whether a reporting entity within a related party group is the primary beneficiary of a VIE. The standard is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019 for public companies. Early adoption is permitted. The Company adopted this guidance in January 1, 2020. There was no impact on the Company's consolidated financial statements. In November 2018, the FASB issued ASU 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606 . This ASU provides guidance on whether certain transactions between collaborative arrangement participants should be accounted for with revenue under Topic 606, specifically when the collaborative arrangement participant is a customer in the context of a unit-of-account. It provides more comparability in the presentation of revenues for certain transactions between collaborative arrangement participants, including adding unit-of-account guidance in Topic 808 to align with the guidance in Topic 606 (that is, a distinct good or service) when an entity is assessing whether the collaborative arrangement or a part of the arrangement is within the scope of Topic 606. The standard is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019 for public companies. Early adoption is permitted. The Company adopted this guidance in January 1, 2020. There was no impact on the Company's consolidated financial statements. Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments (Topic 326) - Credit Losses: Measurement of Credit Losses on Financial Instruments , which provides guidance regarding the measurement of credit losses on financial instruments. The new guidance replaces the incurred loss impairment methodology in the current guidance with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. This ASU will be effective for the Company commencing January 1, 2022. The Company is in the process of assessing the impact of this ASU on our consolidated financial statements and disclosures.

Revenue from Contracts with Cli

Revenue from Contracts with Clients	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Clients	Revenue from Contracts with Clients The Company recognizes revenue to depict the transfer of promised goods or services to clients in an amount that reflects the consideration to which the Company expects to be entitled in exchange for such goods or services. Below is a description of the basic types of contracts from which the Company may earn revenue: Time and Materials Contracts Under the time and materials (“T&M”) arrangements, contract fees are based upon time and materials incurred. The contracts may be structured as basic time and materials, cost plus a margin or time and materials subject to a maximum contract value (the "cap value"). Due to the potential limitation of the cap value, the economic factors of the contracts subject to a cap value differ from the economic factors of basic T&M and cost plus contracts. The majority of the Company’s contracts are for consulting projects where it bills the client monthly at hourly billing rates. The hourly billing rates are determined by contract terms. Under cost plus a margin contracts, the Company charges its clients for its costs, plus a fixed fee or rate. Under time and materials contracts with a cap value, the Company charges the clients for time and materials based upon the work performed however there is a cap or a not to exceed value. There are often instances that a contract is modified to extend the contract value past the cap. As the consideration is variable depending on the outcome of the contract renegotiation, the Company will estimate the total contract price in accordance with the variable consideration guidelines and will only include consideration that it expects to receive from the client. When the Company is reaching the cap value, the contract will be renegotiated, or Hill ceases work when the maximum contract value is reached. The Company will continue to work if it is probable that the contract will be extended. The Company will only include consideration or contract renegotiations to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. If the Company continues to work and is uncertain that a contract change order will be processed, the variable consideration will be constrained to the cap until it is probable that the contract will be renegotiated. The Company is only entitled to consideration for the work it has performed, and the cap value is not a guaranteed contract value. Fixed Price Contracts Under fixed price contracts, the Company’s clients pay an agreed amount negotiated in advance for a specified scope of work. The Company is guaranteed to receive the consideration to the extent that the Company delivers under the contract. The Company recognizes revenue over a period of time on fixed price contracts using the input method based upon direct costs incurred to date, which are compared to total projected direct costs. Costs are the most relevant measure to determine the transfer of the service to the client. The Company assesses contracts quarterly and will recognize any expected future loss before actually incurring the loss. When the Company is expecting to reach the total value of the contract, the Company will begin to negotiate a change order. Change Orders and Claims Change orders are modifications of an original contract. Either the Company or its client may initiate change orders. They may include changes in specifications or design, manner of performance, facilities, equipment, materials, sites and period of completion of the work. Management evaluates when a change order is probable based upon its experience in negotiating change orders, the client’s written approval of such changes or separate documentation of change order costs that are identifiable. Change orders may take time to be formally documented and terms of such change orders are agreed with the client before the work is performed. Sometimes circumstances require that work progresses before an agreement is reached with the client. If the Company is having difficulties in renegotiating the change order, the Company will stop work, record all costs incurred to date, and determine, on a project by project basis, the appropriate final revenue recognition. Claims are amounts in excess of the agreed contract price that the Company seeks to collect from its clients or others for client-caused delays, errors in specifications and designs, contract terminations, change orders that are either in dispute or are unapproved as to both scope and price, or other causes of unanticipated additional contract costs. Costs related to change orders and claims are recognized when they are incurred. The Company evaluates claims on an individual basis and recognizes revenue it believes is probable to collect. U.S. Federal Acquisition Regulations The Company has contracts with the U.S. government that contain provisions requiring compliance with the U.S. Federal Acquisition Regulations (“FAR”). These regulations are generally applicable to all of its federal government contracts and are partially or fully incorporated in many local and state agency contracts. They limit the recovery of certain specified indirect costs on contracts subject to the FAR. Cost-plus contracts covered by the FAR provide for upward or downward adjustments if actual recoverable costs differ from the estimate billed under forward pricing arrangements. Most of the Company's federal government contracts are subject to termination at the convenience of the federal government. Contracts typically provide for reimbursement of costs incurred and payment of fees earned through the date of such termination. Federal government contracts that are subject to the FAR and that are required by state and local governmental agencies to be audited are performed, for the most part, by the Defense Contract Audit Agency (“DCAA”). The DCAA audits the Company’s overhead rates, cost proposals, incurred government contract costs and internal control systems. During the course of its audits, the DCAA may question incurred costs if it believes the Company has accounted for such costs in a manner inconsistent with the requirements of the FAR or Cost Accounting Standards and recommend that its U.S. government corporate administrative contracting officer disallow such costs. Historically, the Company has not incurred significant disallowed costs because of such audits. However, the Company can provide no assurance that the DCAA audits will not result in material disallowances of incurred costs in the future. The Company provides for a refund liability to the extent that it expects to refund some of the consideration received from a client. Disaggregation of Revenues The Company has one operating segment, the Project Management Group, which reflects how the Company is being managed. Additional information related to the Company’s operating segment is provided in Note 12 - Segment and Related Information. The Project Management Group provides extensive construction and project management services to construction owners worldwide. The Company considered the type of client, type of contract and geography for disaggregation of revenue. The Company determined that disaggregating by (1) contract type; and (2) geography would provide the most meaningful information to understand the nature, amount, timing, and uncertainty of its revenues. The type of client does not influence the Company’s revenue generation. Ultimately, the Company is supplying the same services of program management, project management, construction management, project management oversight, troubled project turnaround, staff augmentation, project labor agreement consulting, commissioning, estimating and cost management, labor compliance services and facilities management services. The Company’s contracts are generally long term contracts that are either based upon time and materials incurred or provide for a fixed price. The contract type will determine the level of risk in the contract related to revenue recognition. For purposes of disaggregation of revenue, the contract types have been grouped into: (1) Fixed Price - which include fixed price projects; and, (2) T&M - which include T&M contracts, T&M with a cap and cost plus contracts. The geography of the contracts will depict the level of global economic factors in relation to revenue recognition. The components of the Company’s revenue by contract type and geographic region for the three months ended March 31, 2020 and 2019 are as follows: Three Months Ended March 31, 2020 Three Months Ended March 31, 2019 Fixed Price T&M Total Percent of Total Revenue Fixed Price T&M Total Percent of Total Revenue United States $ 5,023 $ 40,997 $ 46,020 49.3 % $ 3,433 $ 44,669 $ 48,102 48.7 % Latin America 1,171 — 1,171 1.3 % 2,016 418 2,434 2.5 % Europe 6,429 5,108 11,537 12.4 % 6,051 5,283 11,334 11.5 % Middle East 4,883 19,689 24,572 26.3 % 11,365 16,946 28,311 28.7 % Africa 206 7,091 7,297 7.8 % 571 6,378 6,949 7.0 % Asia/Pacific — 2,711 2,711 2.9 % 300 1,253 1,553 1.6 % Total $ 17,712 $ 75,596 $ 93,308 100.0 % $ 23,736 $ 74,947 $ 98,683 100.0 % The Company recognizes revenue when it transfers promised goods or services to clients in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The Company exercises judgment in determining if the contractual criteria are met to determine if a contract with a client exists, specifically in the earlier stages of a project when a formally executed contract may not yet exist. The Company typically has one performance obligation under a contract to provide fully-integrated project management services, and, occasionally, a separate performance obligation to provide facilities management services. Performance obligations are delivered over time as the client receives the service. The consideration promised within a contract may include fixed amounts, variable amounts, or both. Variable consideration is included in the transaction price only to the extent it is probable, in the Company’s judgment, that a significant future reversal in the amount of cumulative revenue recognized under the contract will not occur. In estimating the transaction price for pending change orders, the Company considers all relevant facts, including documented correspondence with the client regarding acknowledgment and/or agreement with the modification, as well as historical experience with the client or similar contractual circumstances. The Company transfers control of its service over time and, therefore, satisfies a performance obligation and recognizes revenue over time by measuring the progress toward complete satisfaction of that performance obligation. The Company’s fixed price projects and T&M contracts subject to a cap value generally use a cost-based input method to measure its progress towards complete satisfaction of the performance obligation as the Company believes this best depicts the transfer of control to the client. Under the cost-based measure of progress, the extent of progress towards completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. Due to the nature of the work required to be performed under the Company’s performance obligations, estimating total revenue and cost at completion on its long term contracts is complex, subject to many variables and requires significant judgment. For basic and cost plus T&M contracts, the Company recognizes revenue over time using the output method which measures progress toward complete satisfaction of the performance obligation based upon actual costs incurred, using the right to invoice practical expedient. Accounts Receivable Accounts receivable includes amounts billed and currently due from clients and amounts for work performed which have not been billed to date. The billed and unbilled amounts are stated at the net estimated realizable value. The Company maintains an allowance for doubtful accounts to provide for the estimated amount of receivables that will not be collected. The allowance is based upon an assessment of client creditworthiness, historical payment experience and the age of outstanding receivables. Contract Assets and Liabilities Contract assets include unbilled amounts typically resulting from performance under long-term contracts where the revenue recognized exceeds the amount billed to the client. Retainage receivable is included in contract assets. The current portion of retainage receivable is a contract asset, which prior to the adoption of ASC 606, had been classified within accounts receivable. The Company’s contract liabilities consist of advance payments and billings in excess of revenue recognized and are reported as deferred revenue in the consolidated balance sheets. The Company classifies billings in excess of revenue recognized as deferred revenue as current or non-current based on the timing of when revenue is expected to be recognized. The difference between the opening and closing balances of the Company’s contract assets and contract liabilities primarily results from the timing of the Company’s performance and client payments. The amount of revenue recognized during the three months ended March 31, 2020 and 2019 that was included in the deferred revenue balance at the beginning of the periods was $7,861 and $9,241 , respectively. Remaining Performance Obligations The remaining performance obligations represent the aggregate transaction price of executed contracts with clients for which work has partially been performed or not started as of the end of the reporting period. The Company’s remaining performance obligations include projects that have a written award, a letter of intent, a notice to proceed or an agreed upon work order to perform work on mutually accepted terms and conditions. T&M contracts are excluded from the remaining performance obligation as these contracts are not fixed price contracts and the consideration expected under these contracts is variable as it is based upon hours and costs incurred in accordance with the variable consideration optional exemption. As of March 31, 2020 and December 31, 2019 , the aggregate amount of the transaction price allocated to remaining performance obligations was $105,370 and $113,592 , respectively. During the following 12 months, approximately 50.0% of the remaining performance obligations are expected to be recognized as revenue with the remaining balance recognized over 1 to 5 years.

Accounts Receivable

Accounts Receivable	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Accounts Receivable	Accounts Receivable The components of accounts receivable and accounts receivable - affiliates reflected in the Company's consolidated balance sheets are as follows: Accounts Receivable March 31, 2020 December 31, 2019 Billed (1) $ 128,320 $ 132,339 Unbilled (2) 35,122 30,026 163,442 162,365 Allowance for doubtful accounts (1) (55,333 ) (58,473 ) Accounts receivable, net $ 108,109 $ 103,892 Accounts Receivable - Affiliates Billed (3) $ 13,895 $ 12,546 Unbilled (2) 11,658 6,888 $ 25,553 $ 19,434 Allowance for doubtful accounts (634 ) (658 ) Accounts receivable - affiliates, net $ 24,919 $ 18,776 (1) Includes $32,162 and $32,864 related to amounts due from a client in Africa as of March 31, 2020 and December 31, 2019 , respectively. (2) Amount is net of unbilled reserves. (3) Includes $401 and $397 of retainage receivables due from affiliates as of March 31, 2020 and December 31, 2019 , respectively.

Intangible Assets

Intangible Assets	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets The following table summarizes the Company’s acquired intangible assets: March 31, 2020 December 31, 2019 Gross Accumulated Gross Accumulated Client relationships $ 1,080 $ 875 $ 1,080 $ 848 Total $ 1,080 $ 875 $ 1,080 $ 848 Intangible assets, net $ 205 $ 232 The Company amortizes client relationship intangible assets over the estimated useful life of ten years . For the three months ended March 31, 2020 and 2019 , such amortization expense was $27 and $114 , respectively. The following table presents the estimated amortization expense for the next five years: Estimated Amortization Expense Year ending December 31, 2020 (remaining 9 months) $ 52 2021 51 2022 51 2023 51 2024 —

Goodwill

Goodwill	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill The following table summarizes the changes in the Company’s carrying value of goodwill during the three months ended March 31, 2020 : Balance, December 31, 2019 $ 48,024 Translation adjustments (1) (3,433 ) Balance, March 31, 2020 $ 44,591 (1) The translation adjustment was calculated based on the foreign currency exchange rates as of March 31, 2020 . The Company performed its 2019 annual impairment test effective July 1, 2019, and noted no impairment. Based on the valuation as of July 1, 2019, the fair value of the Company exceeded its carrying value. The Company performs its annual impairment test during the second half of each year unless events or circumstances indicate an impairment may have occurred before that time. Despite the excess fair value identified in our 2019 impairment assessment, the Company determined that the significant decline in its market capitalization as a result of the COVID-19 pandemic indicated that an impairment loss may have been incurred. The Company bypassed the qualitative assessment and proceeded directly to performing the quantitative goodwill impairment test. The quantitative goodwill impairment test concluded that the fair value of the Company (reporting unit) exceeded its carrying amount at March 31, 2020, and therefore, goodwill is not considered impaired. The Company’s changes in estimates and assumptions, including decreases in stock price and market capitalization, could materially affect the determination of fair value and/or conclusions on goodwill impairment. As a result of recent events, including market volatility and the impact on the global economy, it is at least reasonably possible that changes in one or more of those assumptions could result in impairment of our goodwill in future periods.

Accounts Payable and Accrued Ex

Accounts Payable and Accrued Expenses	3 Months Ended
	Mar. 31, 2020
Payables and Accruals [Abstract]
Accounts Payable and Accrued Expenses	Accounts Payable and Accrued Expenses Below are the components of accounts payable and accrued expenses: March 31, 2020 December 31, 2019 Accounts payable $ 25,659 $ 22,102 Accrued payroll and related expenses 27,546 28,874 Accrued subcontractor fees 8,966 9,405 Accrued agency fees 193 239 Accrued legal and professional fees 1,787 2,169 Other accrued expenses 2,243 2,383 $ 66,394 $ 65,172

Notes Payable and Long-Term Deb

Notes Payable and Long-Term Debt	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Notes Payable and Long-Term Debt	Notes Payable and Long-Term Debt The table below reflects the Company's notes payable and long-term debt, which includes credit facilities: Interest Rate (1) Balance Outstanding as of Loan Maturity Interest Rate Type March 31, December 31, March 31, December 31, Secured Credit Facilities Hill International, Inc. - Société Générale 2017 Term Loan Facility 06/20/2023 Variable 7.86% 7.92% $ 29,175 $ 29,250 Hill International, Inc. - Société Générale Domestic Revolving Credit Facility (2) 05/04/2022 Variable 6.18% 6.27% 18,400 9,400 Hill International N.V.. - Société Générale International Revolving Credit Facility (3) 05/04/2022 Variable 4.14% 4.16% 2,811 2,302 Unsecured Credit Facilities Hill International, Inc. - First Abu Dhabi Bank ("FAB") PJSC Overdraft Credit Facility (4) 04/18/2021 Variable 5.79% 5.81% 1,997 593 Hill International Brasil S.A. - Revolving Credit Facility (5) 06/12/2020 Fixed 2.80% 3.24% 386 498 Unsecured Notes Payable and Long-Term Debt Hill International Spain SA-Bankia S.A. & Bankinter S.A.(6) 12/31/2021 Fixed 2.21% 2.21% 907 1,054 Philadelphia Industrial Development Corporation Loan 03/31/2027 Fixed 2.79% 2.79% 466 486 Total notes payable and long-term debt, gross $ 54,142 $ 43,583 Less: unamortized discount and deferred financing costs related to Société Générale 2017 Term Loan Facility (601 ) (641 ) Notes payable and long-term debt $ 53,541 $ 42,942 Current portion of notes payable $ 3,258 $ 1,972 Current portion of unamortized debt discount and deferred financing costs $ (187 ) $ (180 ) Current maturities of notes payable and long-term debt $ 3,071 $ 1,792 Notes payable and long-term debt, net of current maturities $ 50,470 $ 41,150 (1) Interest rates for variable interest rate debt are reflected on a weighted average basis through March 31, 2020 since the loan origination or modification date. (2) As of March 31, 2020 and December 31, 2019 , the Company had $5,100 and $6,548 of outstanding letters of credit, respectively, in addition to the balances outstanding above, which resulted in $1,500 and $9,052 of available borrowing capacity under the Domestic Revolving Credit Facility, respectively. The amounts available were based on the maximum borrowing capacity of $25,000 as of March 31, 2020 and December 31, 2019 . See additional information below related to this secured revolving credit facility. (3) As of March 31, 2020 and December 31, 2019 , the Company had $2,162 and $3,145 of outstanding letters of credit, respectively, in addition to the balances outstanding above, which resulted in $165 and $2,232 of available borrowing capacity under the International Revolving Credit Facility, respectively. The amounts available were based on the Company's borrowing capacity of $5,138 and $7,679 as of March 31, 2020 and December 31, 2019 , respectively. See additional information below related to this secured revolving credit facility. (4) FAB credit facility lender was formerly known as National Bank of Abu Dhabi. There is no stated maturity date, however, the loan is subject to annual review in April of each year, or at any other time as determined by FAB. Therefore, the amount outstanding is reflected within the current maturities of notes payable and long-term debt. Balances outstanding are reflected in U.S. dollars based on the conversion rates from AED as of March 31, 2020 and December 31, 2019 . The Company had $1,134 and $2,538 of availability under the credit facility as of March 31, 2020 and December 31, 2019 , respectively. (5) Unsecured revolving credit facility is subject to automatic renewals on a monthly basis. Effective with the November 2019 renewal of the unsecured revolving credit facility, the interest rate was reduced by the credit facility lender from 3.30% to 2.80% . The Company had no availability under the unsecured credit facility as of March 31, 2020 and December 31, 2019 . The amounts outstanding are based on conversion rates from Brazilian Real as of March 31, 2020 and December 31, 2019 . (6) Balances outstanding are reflected in U.S. dollars based on the conversion rates from Euros as of March 31, 2020 and December 31, 2019 . Secured Credit Facilities The Company's secured credit facilities with Société Générale (the "International Lender") and other U.S. Loan Parties (the "U.S. Lenders") under a 2017 Term Loan of $30,000 (the "2017 Term Loan Facility"), a $25,000 U.S.-denominated revolving credit facility (the "Domestic Revolving Credit Facility"; together with the 2017 Term, the "U.S. Credit Facilities") and a €9,156 ( $10,000 at closing) Euro-denominated revolving credit facility (the "International Revolving Credit Facility"; together with the U.S. Credit Facilities, the "Secured Credit Facilities") contain customary default provisions, representations and warranties, and affirmative and negative covenants, and require the Company to comply with certain financial and reporting covenants. The financial covenant is comprised of a maximum Consolidated Net Leverage Ratio of 3.00 to 1.00 for any fiscal quarter ending on or subsequent to March 31, 2017 for the trailing twelve months then-ended. The Consolidated Net Leverage Ratio is the ratio of (a) consolidated total debt (minus unrestricted cash and cash equivalents) to consolidated earnings before interest, taxes, depreciation, amortization, share-based compensation and other non-cash charges, including bad debt expense, certain one-time litigation and transaction related expenses, and restructuring charges for the trailing twelve months. In the event of a default, the U.S. Lender and the International Lender may increase the interest rates by 2.0% . The Company was in compliance with this financial covenant at March 31, 2020 . The unamortized debt issuance costs under the Domestic and International Revolving Credit Facilities were $1,175 and $1,317 at March 31, 2020 and December 31, 2019 , respectively, and were included in prepaid expenses and other current assets and other assets in the consolidated balance sheets. Commitment fees are calculated at 0.50% annually on the average daily unused portion of the Domestic Revolving Credit Facility, and are calculated at 0.75% annually on the average daily unused portion of the International Revolving Credit Facility. Generally, the obligations of the Company under the Domestic Revolving Credit Facility are secured by a first-priority security interest in the Eligible Domestic Receivables, cash proceeds and bank accounts of the Company and certain of the Company’s U.S. subsidiaries, and a second-priority security interest in substantially all other assets of the Company and such subsidiaries. The obligations of the Subsidiary under the International Revolving Credit Facility are generally secured by a first-priority security interest in substantially all accounts receivable and cash proceeds thereof, certain bank accounts of the Subsidiary and certain of the Company’s non-U.S. subsidiaries, and a second-priority security interest in substantially all other assets of the Company and certain of the Company’s U.S. and non-U.S. subsidiaries. Other Financing Arrangements On May 1, 2019, subsequent to the maturity of the Company's previous commercial premium financing arrangement in February 28, 2019 with AFCO Premium Credit LLC ("AFCO"), the Company entered into a new financing agreement for the renewal of its corporate insurance policies with AFCO for $3,032 . The terms of the arrangement include a $258 down payment, followed by monthly payments to be made over an eleven -month period at a 4.57% interest rate through March 31, 2020. At March 31, 2020 , the balance payable to AFCO for this arrangement was paid in full. At December 31, 2019 , the balance payable of $768

Share-Based Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation The Company recognized total share-based compensation expense in selling, general and administrative expenses in the consolidated statement of operations of $399 and $241 for the three months ended March 31, 2020 and 2019 . The Company's related share-based compensation is comprised of the following: Restricted Stock Units During the three months ended March 31, 2020 and 2019 , the Company granted certain employees and executive officers equity awards in the form of restricted stock units ("RSU") that are subject to a combination of time and performance-based conditions under the 2017 Equity Compensation Plan (the "2017 Plan"), totaling 723 and 758 RSUs, respectively. Each RSU entitles the grantee to one unit of the Company's common stock. The time-based RSUs vest annually over a three -year period on the anniversary date of each grant. Unvested time-based RSUs will be forfeited if the grantee separates from the Company prior to its vesting date. During the three months ended March 31, 2020 and 2019 , the related compensation expense was recorded based on a weighted average price per share of $3.28 and $3.23 , respectively. The number of common shares to be issued under the performance-based RSUs will be determined based on three levels of performance metrics based on the Company's earnings and will be assessed on an annual basis for the years ended December 31, 2020, 2021 and 2022 for the RSUs granted during the three months ended March 31, 2020 and for the years ended December 31, 2019, 2020 and 2021 for the RSUs granted during three months ended March 31, 2019 . If the Company meets the performance metrics for any one of the measurement periods, such units will vest on the next anniversary date of the grant date. All vested RSUs will be settled on the third anniversary of the grant date. Unvested RSUs are subject to forfeiture if the grantee separates from the Company prior to its vesting date. During the three months ended March 31, 2020 and 2019 , the Company determined it was not probable that the target performance metric would be met for each of the RSU grants and, therefore, did not record any share-based compensation expense related to such RSUs. Deferred Stock Units Deferred Stock Units ("DSU") issued under the 2017 Plan entitle participants to receive one share of the Company's common stock for each DSU and they will vest immediately upon separation from the Company. The compensation expense related to these units was determined based on the stock price of the Company's common stock on the grant date of the DSUs. During the three months ended March 31, 2020 and 2019 , 8 DSUs were granted during both periods. These DSU grants were issued to the Company's board of directors (the "Board") in lieu of their cash portion of their annual retainer, at their election. For the three months ended March 31, 2020 and 2019 , the related compensation expense is recorded based on a weighted average price per share of $3.18 and $3.15 , respectively. Stock Options At March 31, 2020 and 2019 , the Company had approximately 1,616 and 1,417 stock options outstanding, respectively, with a weighted average exercise price of $4.03 and $4.33 , respectively. During the three months ended March 31, 2020 and 2019 , options lapsed for approximately 263 and 525 shares, respectively, with a weighted average exercise price of $3.67 and $4.42 , respectively.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company calculates the interim tax expense based on an annual effective tax rate ("AETR"). The AETR represents the Company’s estimated effective tax rate for the year based on full year projection of tax expense, divided by the projection of full year pretax book income/(loss) among the various foreign tax jurisdictions, adjusted for discrete transactions occurring during the period. The effective tax rates for the three months ended March 31, 2020 and 2019 were (33.3)% and (112.5)% , respectively. The change in the Company’s effective tax rate for the three months ended March 31, 2020 from the three months ended March 31, 2019 was primarily due to the mix of pretax earnings in jurisdictions with different jurisdictional tax rates, as well as not having the ability to benefit from losses in jurisdictions that have a history of negative earnings. The reserve for uncertain tax positions amounted to $4,582 and $4,615 at March 31, 2020 and December 31, 2019 , respectively. The Company’s policy is to record income tax related interest and penalties in income tax expense. The Company recorded tax related interest and penalties of $3 and $2 for the three months ended March 31, 2020 , and 2019 , respectively. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that all, or some portion, of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities and projected future taxable income in making this assessment. Management evaluates the need for valuation allowances on the deferred tax assets according to the provisions of ASC 740, Income Taxes. In making this determination, management assesses all available evidence, both positive and negative, at the balance sheet date. This includes, but is not limited to, recent earnings, internally-prepared income projections, and historical financial performance.

Segment and Related Information

Segment and Related Information	3 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Segment and Related Information	Segment and Related Information The Company operates as one reporting segment which reflects how the Company is managed, which provides construction and project management services to construction owners worldwide. Such services include program management, project management, construction management, project management oversight, troubled project turnaround, staff augmentation, project labor agreement consulting, commissioning, estimating and cost management, labor compliance services (collectively, "integrated project management") and facilities management services. The following tables present certain information for operations: Total Revenue by Geographic Region: Three Months Ended March 31, 2020 2019 United States $ 46,020 49.3 % $ 48,102 48.7 % Latin America 1,171 1.3 % 2,434 2.5 % Europe 11,537 12.4 % 11,334 11.5 % Middle East 24,572 26.3 % 28,311 28.7 % Africa 7,297 7.8 % 6,949 7.0 % Asia/Pacific 2,711 2.9 % 1,553 1.6 % Total $ 93,308 100.0 % $ 98,683 100.0 % Consulting Fee Revenue by Geographic Region: Three Months Ended March 31, 2020 2019 United States $ 34,044 44.2 % $ 32,595 41.2 % Latin America 1,171 1.5 % 2,429 3.1 % Europe 10,581 13.7 % 10,902 13.8 % Middle East 23,413 30.3 % 25,260 32.0 % Africa 6,602 8.6 % 6,411 8.1 % Asia/Pacific 1,339 1.7 % 1,403 1.8 % Total $ 77,150 100.0 % $ 79,000 100.0 % For the three months ended March 31, 2020 and 2019 , the United States and the United Arab Emirates were the only countries to account for 10% or more of total revenue. Operating Profit (Loss) by Geographic Region: Three Months Ended 2020 2019 United States (1) $ 7,388 $ 5,742 Latin America (243 ) 277 Europe (1) 1,697 882 Middle East (1) 1,098 5,119 Africa 863 1,610 Asia/Pacific 183 (478 ) Corporate (2) (14,851 ) (12,613 ) Total $ (3,865 ) $ 539 (1) includes Hill's share of loss (profit) of equity method affiliates on the Consolidated Statements of Operations. (2) includes foreign exchange expense (benefit) of $4,051 and $(26) for the three months ended March 31, 2020 and 2019 , respectively. Depreciation and Amortization Expense: Three Months Ended 2020 2019 Project Management $ 364 $ 774 Corporate (1) 2,060 17 Total $ 2,424 $ 791 (1) includes $1,582 additional depreciation charge for the write-off of leasehold improvements related to the Company subletting office space in Philadelphia to a third party. Total Revenue By Client Type: Three Months Ended March 31, 2020 2019 U.S. federal government $ 4,610 4.9 % $ 4,692 4.8 % U.S. state, regional and local governments 30,551 32.7 % 30,895 31.3 % Foreign governments 25,364 27.2 % 25,679 26.0 % Private sector 32,783 35.2 % 37,417 37.9 % Total $ 93,308 100.0 % $ 98,683 100.0 % Property, Plant and Equipment, Net, by Geographic Location: March 31, 2020 December 31, 2019 United States $ 8,188 $ 9,701 Latin America 525 700 Europe 447 473 Middle East 809 803 Africa 131 139 Asia/Pacific 67 79 Total $ 10,167 $ 11,895

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings From time to time, the Company is a defendant or plaintiff in various legal proceedings which arise in the normal course of business. As such the Company is required to assess the likelihood of any adverse outcomes to these proceedings as well as potential ranges of probable losses. A determination of the amount of the provision required for commitments and contingencies, if any, which would be charged to earnings, is made after careful analysis of each proceeding. The provision may change in the future due to new developments or changes in circumstances. Changes in the provision could increase or decrease the Company’s earnings in the period the changes are made. It is the opinion of management, after consultation with legal counsel, that the ultimate resolution of these proceedings will not have a material adverse effect on the Company’s financial condition, results of operations or cash flows. Knowles Limited (“Knowles”), a subsidiary of the Company, is a party to an arbitration proceeding instituted on July 8, 2014 in which Knowles claimed that it was entitled to payment for services rendered to Celtic Bioenergy Limited (“Celtic”). The arbitrator decided in favor of Knowles. The arbitrator’s award was appealed by Celtic to the U.K. High Court of Justice, Queen’s Bench Division, Technology and Construction Court (“Court”). On March 16, 2017, the Court (1) determined that certain relevant facts had been deliberately withheld from the arbitrator by an employee of Knowles and (2) remitted the challenged parts of the arbitrator’s award back to the arbitrator to consider the award in possession of the full facts. In May 2019, Celtic issued a claim against Knowles for negligent application and a hearing was held in December 2019. The Company is awaiting a final determination. Loss on Performance Bond On February 8, 2018, the Company received notice from the First Abu Dhabi Bank ("FAB", formerly known as the National Bank of Abu Dhabi) that Public Authority of Housing Welfare of Kuwait submitted a claim for payment on a Performance Guarantee issued by the Company for approximately $7,938 for a project located in Kuwait. FAB subsequently issued, on behalf of the Company, a payment on February 15, 2018. The Company is taking legal action to recover the full Performance Guarantee amount. On September 20, 2018 the Kuwait First Instance Court dismissed the Company's case. As a result, the Company fully reserved the performance guarantee payment above in the first quarter of 2018 and it is presented as "Loss on Performance Bond" on the consolidated statements of operations. The Company filed an appeal before the Kuwait Court of Appeals seeking referral of the matter to a panel of experts for determination. On April 21, 2019, the Court of Appeals ruled to refer the matter to the Kuwait Experts Department. Hearings with the Kuwait Experts Department were held during July and September 2019. A final report was issued by the panel of experts in October 2019 for the held hearings on January 7, 2020 and February 4, 2020 and reserved the case for judgment to be issued on April 21, 2020. Due to the COVID-19 pandemic, all courts in Kuwait are closed until May 31, 2020. The Kuwait Court of Appeals will determine a new date for the judgment to be issued after the courts reopen. Other The Company has identified a potential tax liability related to certain foreign subsidiaries’ failure to comply with laws and regulations of the jurisdictions, outside of their home country, in which their employees provided services. The Company has estimated the potential liability to be approximately $1,196 , which is included in other liabilities in the consolidated balance sheet at March 31, 2020 .

Operating Leases

Operating Leases	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Operating Leases	Operating Leases The Company leases office space, equipment and vehicles throughout the world. Many of the Company's operating leases include one or more options to renew at the Company's sole discretion. The lease renewal option terms generally range from 1 month to 5 years for office leases. The determination of whether to include any renewal options is made by the Company at lease inception when establishing the term of the lease. Leases with an initial term of 12 months or less are not recorded in the consolidated balance sheet as of March 31, 2020 . Rent expense for operating leases is recognized on a straight-line basis over the lease term from the lease commencement date through the scheduled expiration date. Total rent expense of approximately $2,307 and $1,986 for the three months ended March 31, 2020 and 2019 , respectively, is included in selling, general and administrative and direct expenses in the consolidated statements of operations. Total rent expense for the three months ended March 31, 2020 and 2019 included $389 and $292 , respectively, that was associated with leases with an initial term of 12 months or less, in addition to variable costs the Company is responsible for paying on all leases. Some of the Company's lease arrangements require periodic increases in the Company's base rent that may be subject to certain economic indexes, among other items. In addition, these leases may require the Company to pay property taxes, utilities and other costs related to several of its leased office facilities. The Company subleases certain real estate to third parties. The sublease income recognized for the three months ended March 31, 2020 and 2019 was $176 and $143 , respectively. The following is a schedule of maturities of lease liabilities by year as of March 31, 2020 : Total Operating Lease Payments 2020 (excluding the three months ended March 31, 2020) $ 6,628 2021 4,999 2022 4,089 2023 3,321 2024 2,436 Thereafter 4,440 Total minimum lease payments (1) (2) 25,913 Less amount representing imputed interest 4,205 Present value of lease obligations $ 21,708 Weighted average remaining lease term (years) 5.00 Weighted average discount rate 6.97 % (1) Partially includes rent expense amounts payable in various foreign currencies and are based on the foreign currency exchange spot rates as of March 31, 2020 , where applicable. (2) Includes lease agreements and extensions that have been executed, but has not yet commenced, as of March 31, 2020 .

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event Effective April 1, 2020, the Company amended its Secured Credit Facility credit agreements with Société Générale that increased the credit commitment with the lender under the Domestic Revolving Credit Facility by $3,500 from $25,000 to $28,500 and simultaneously decreased the credit commitment with the lender under the International Revolving Credit Facility by €3,179 (approximately $3,500 at closing) from €9,156 ( $10,093 ) to €5,977 ( $6,593 ).

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary	Summary The accompanying unaudited interim consolidated financial statements were prepared in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") pertaining to reports on Form 10-Q and should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 . Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles ("U.S. GAAP") for complete financial statements. In the opinion of management, these statements include all adjustments (consisting only of normal, recurring adjustments) necessary for a fair presentation of the consolidated financial statements. The consolidated financial statements include the accounts of Hill and its wholly and majority-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The interim operating results are not necessarily indicative of the results for a full year.
Reclassifications	Reclassification A reclassification was made in the presentation of the consolidated statements of cash flow for the three months ended March 31, 2019 . Net borrowings on revolving loans previously reported as $1,192 was broken out between repayments of revolving loans and proceeds from revolving loans of $(8,662) and $9,854 , respectively, to conform to current year presentation. Certain back-office expenses and foreign currency translation gains and losses that had previously been included in the individual regions in the operating profit/(loss) table presentation are currently being included within the corporate costs line item on the operating profit/(loss) tables herein. The related 2019 prior period operating profit (loss) by geographic region and corporate costs have been recast to reflect this change. This change only affects the presentation in the operating profit/(loss) tables and has no impact on total operating profit/(loss) reported. The Company's Consolidated Statements of Operations for the three months ended March 31, 2019 reflects a change in the presentation of revenue. Total Revenue of $98,683 for the three months ended March 31, 2019 was broken out between consulting fee revenue ("CFR") and reimbursable expenses to conform to current year presentation. CFR is the revenue, excluding reimbursable costs. The Company believes that CFR is an important measure because it represents the revenue on which gross profit is earned.
Foreign Currency Translations and Transactions	Foreign Currency Translations and Transactions Assets and liabilities of all foreign operations are translated at period-end rates of exchange while revenues and expenses are translated at the average monthly exchange rates. Gains or losses resulting from translating foreign currency financial statements are accumulated in a separate component of stockholders’ equity titled accumulated other comprehensive loss until the entity is sold or substantially liquidated. Gains or losses arising from foreign currency transactions (transactions denominated in a currency other than the entity’s local currency), including those resulting from intercompany transactions, are reflected in selling, general and administrative expenses in the consolidated statements of operations. The impact of foreign exchange on long-term intercompany loans, for which repayment has not been scheduled or planned and permanent equity has been elected, are recorded in accumulated other comprehensive loss on the consolidated balance sheet.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash equivalents and accounts receivable. The Company maintains its cash accounts with high quality financial institutions. Although the Company believes that the financial institutions with which it does business will be able to fulfill their commitments, there is no assurance that those institutions will be able to continue to do so.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The allowance for doubtful accounts is an estimate prepared by management based on identification of the collectability of specific accounts and the overall condition of the receivable portfolios. When evaluating the adequacy of the allowance for doubtful accounts, the Company specifically analyzes trade receivables, including retainage receivable, historical bad debts, client credits, client concentrations, current economic trends and changes in client payment terms. If the financial condition of clients were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. Likewise, should the Company determine that it would be able to realize more of its receivables in the future than previously estimated, an adjustment to the allowance would increase earnings in the period such determination was made. The allowance for doubtful accounts is reviewed on a quarterly basis and adjustments are recorded as deemed necessary.
Retainage Receivable and Revenue Recognition	Revenue Recognition The Company generates revenue primarily from providing professional services to its clients under various types of contracts. In providing these services, the Company may incur reimbursable expenses, which consist principally of amounts paid to subcontractors and other third parties and travel and other job related expenses that are contractually reimbursable from clients. The Company includes reimbursable expenses in computing and reporting its total revenue as long as the Company remains responsible to the client for the fulfillment of the contract and for the overall acceptability of all services provided. If estimated total costs on any contract project a loss, the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses, and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated. These loss projects are re-assessed for each subsequent reporting period until the project is complete. Such revisions could occur at any time and the effects may be material. See Note 4 - Revenue from Contracts with Clients for more detail, regarding how the Company recognizes revenue under each type of its contractual arrangements. Retainage Receivable Retainage receivable represents balances billed but not paid by clients pursuant to retainage provisions in certain contracts and will be due upon completion of specific tasks or the completion of the contract.
Income Taxes	Income Taxes The Company estimates income taxes in each of the jurisdictions in which it operates. This process involves estimating its actual current tax exposure together with assessing temporary differences resulting from differing treatment of items for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the Company’s consolidated balance sheets. The Company assesses the likelihood that the deferred tax assets will be recovered from future taxable income and to the extent it believes recovery is not likely, the Company establishes a valuation allowance. To the extent the Company establishes a valuation allowance in a period, it must include an expense within the tax provision in the consolidated statements of operations. The Company has recorded a valuation allowance to reduce the deferred tax asset to an amount that is more likely than not to be realized in future years. If the Company determines in the future that it is “more likely than not” (i.e., a likelihood greater than 50 percent) to be allowed by the tax jurisdiction based solely on the technical merits of the position, that the deferred tax assets subject to the valuation allowance will be realized, then the previously provided valuation allowance will be adjusted. The Company recognizes a tax benefit in the financial statements for an uncertain tax position only if management’s assessment is that the position is more likely than not that the benefit will be ultimately realized. The term “tax position” refers to a position in a previously filed tax return or a position expected to be taken in a future tax return that is reflected in measuring current or deferred income tax assets and liabilities for interim or annual periods.
Restricted Cash	Restricted Cash Restricted cash primarily represents cash collateral required to be maintained in foreign bank accounts to serve as collateral for letters of credit, bonds or guarantees on certain projects. The cash will remain restricted until the respective project has been completed, which typically is greater than one year.
Earnings (loss) per Share	Earnings (loss) per Share Basic earnings (loss) per common share have been computed using the weighted-average number of shares of common stock outstanding during the period. Diluted earnings (loss) per common share incorporates the incremental shares issuable upon the assumed exercise of stock options, the assumed vesting of stock and deferred and restricted stock unit awards using the treasury stock method, if dilutive. The Company has outstanding options to purchase approximately 1,616 shares and 1,417 shares at March 31, 2020 and 2019 , respectively. In addition, the Company had 789 and 471 restricted and deferred stock units outstanding at March 31, 2020 and 2019 , respectively. These awards were excluded from the calculation of diluted loss per share for the three months ended March 31, 2020 and 2019 because they were anti-dilutive.
New Accounting Pronouncements	New Accounting Pronouncements Changes to U.S. GAAP are typically established by the Financial Accounting Standards Board (“FASB”) in the form of accounting standards updates (“ASUs”) to the FASB’s Accounting Standards Codification (“ASC”). The Company considers the applicability and impact of all ASUs and, based on its assessment, determined that any recently issued or proposed ASUs not listed below are either not applicable to the Company or adoption will have minimal impact on its consolidated financial statements. For additional information with respect to new accounting pronouncements and the impact of these pronouncements on our consolidated financial statements, see Note 3 to the consolidated financial statements in Item 8 of Form 10-K for the year ended December 31, 2019 filed with the SEC on March 26, 2020 . See update below. Recently Adopted Accounting Pronouncements In January 2017, the FASB issued ASU 2017-4, Intangibles - Goodwill and Other (Topic 350), which removes step 2 from the goodwill impairment test. As a result, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting units’ fair value. The guidance is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for annual or interim goodwill impairment tests performed on testing dates after January 1, 2017, and the prospective transition method should be applied. The Company adopted this guidance on January 1, 2020 and it did not materially impact its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this update. The amendments in this update are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption of the amendments in this update is permitted, including adoption in any interim period, for all entities. The amendments in this update should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company adopted this guidance on January 1, 2020 on a prospective basis and will begin to capitalize certain implementation costs that may have been previously expensed as incurred. There was no impact on the Company's consolidated financial statements on the date of implementation. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities ("VIE") . The amendments in this ASU for determining whether a decision-making fee is a variable interest require reporting entities to consider indirect interests held through related parties under common control on a proportional basis rather than as the equivalent of a direct interest in its entirety (as currently required by GAAP). These amendments will create alignment between determining whether a decision-making fee is a variable interest and determining whether a reporting entity within a related party group is the primary beneficiary of a VIE. The standard is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019 for public companies. Early adoption is permitted. The Company adopted this guidance in January 1, 2020. There was no impact on the Company's consolidated financial statements. In November 2018, the FASB issued ASU 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606 . This ASU provides guidance on whether certain transactions between collaborative arrangement participants should be accounted for with revenue under Topic 606, specifically when the collaborative arrangement participant is a customer in the context of a unit-of-account. It provides more comparability in the presentation of revenues for certain transactions between collaborative arrangement participants, including adding unit-of-account guidance in Topic 808 to align with the guidance in Topic 606 (that is, a distinct good or service) when an entity is assessing whether the collaborative arrangement or a part of the arrangement is within the scope of Topic 606. The standard is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2019 for public companies. Early adoption is permitted. The Company adopted this guidance in January 1, 2020. There was no impact on the Company's consolidated financial statements. Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments (Topic 326) - Credit Losses: Measurement of Credit Losses on Financial Instruments , which provides guidance regarding the measurement of credit losses on financial instruments. The new guidance replaces the incurred loss impairment methodology in the current guidance with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. This ASU will be effective for the Company commencing January 1, 2022. The Company is in the process of assessing the impact of this ASU on our consolidated financial statements and disclosures.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the balance sheets that sum to the total of the same such amounts shown in the statements of cash flows: March 31, 2020 December 31, 2019 Cash and cash equivalents $ 16,083 $ 15,915 Cash - restricted 3,489 4,666 Cash - restricted, net of current portion 3,921 4,401 Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 23,493 $ 24,982
Schedule of Earnings Per Share	The following table provides a reconciliation to net loss used in the numerator for loss per share attributable to Hill: Three Months Ended March 31, 2020 2019 Net loss $ (6,422 ) $ (2,068 ) Less: net earnings - non-controlling interests 159 67 Net loss attributable to Hill International, Inc. $ (6,581 ) $ (2,135 ) Basic weighted average common shares outstanding 56,543 55,946 Effect of dilutive securities: Stock options — — Unvested share-based compensation units $ — $ — Diluted weighted average common shares outstanding 56,543 55,946 Basic and diluted net loss per share attributable to Hill $ (0.12 ) $ (0.04 )

Revenue from Contracts with C_2

Revenue from Contracts with Clients (Tables)	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The components of the Company’s revenue by contract type and geographic region for the three months ended March 31, 2020 and 2019 are as follows: Three Months Ended March 31, 2020 Three Months Ended March 31, 2019 Fixed Price T&M Total Percent of Total Revenue Fixed Price T&M Total Percent of Total Revenue United States $ 5,023 $ 40,997 $ 46,020 49.3 % $ 3,433 $ 44,669 $ 48,102 48.7 % Latin America 1,171 — 1,171 1.3 % 2,016 418 2,434 2.5 % Europe 6,429 5,108 11,537 12.4 % 6,051 5,283 11,334 11.5 % Middle East 4,883 19,689 24,572 26.3 % 11,365 16,946 28,311 28.7 % Africa 206 7,091 7,297 7.8 % 571 6,378 6,949 7.0 % Asia/Pacific — 2,711 2,711 2.9 % 300 1,253 1,553 1.6 % Total $ 17,712 $ 75,596 $ 93,308 100.0 % $ 23,736 $ 74,947 $ 98,683 100.0 %

Accounts Receivable (Tables)

Accounts Receivable (Tables)	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Schedule of components of accounts receivable	The components of accounts receivable and accounts receivable - affiliates reflected in the Company's consolidated balance sheets are as follows: Accounts Receivable March 31, 2020 December 31, 2019 Billed (1) $ 128,320 $ 132,339 Unbilled (2) 35,122 30,026 163,442 162,365 Allowance for doubtful accounts (1) (55,333 ) (58,473 ) Accounts receivable, net $ 108,109 $ 103,892 Accounts Receivable - Affiliates Billed (3) $ 13,895 $ 12,546 Unbilled (2) 11,658 6,888 $ 25,553 $ 19,434 Allowance for doubtful accounts (634 ) (658 ) Accounts receivable - affiliates, net $ 24,919 $ 18,776 (1) Includes $32,162 and $32,864 related to amounts due from a client in Africa as of March 31, 2020 and December 31, 2019 , respectively. (2) Amount is net of unbilled reserves. (3) Includes $401 and $397 of retainage receivables due from affiliates as of March 31, 2020 and December 31, 2019 , respectively.

Intangible Assets (Tables)

Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of acquired intangible assets	The following table summarizes the Company’s acquired intangible assets: March 31, 2020 December 31, 2019 Gross Accumulated Gross Accumulated Client relationships $ 1,080 $ 875 $ 1,080 $ 848 Total $ 1,080 $ 875 $ 1,080 $ 848 Intangible assets, net $ 205 $ 232
Summary of estimated amortization expense of intangible assets for the next five years	The following table presents the estimated amortization expense for the next five years: Estimated Amortization Expense Year ending December 31, 2020 (remaining 9 months) $ 52 2021 51 2022 51 2023 51 2024 —

Goodwill (Tables)

Goodwill (Tables)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of changes in the Company's carrying value of goodwill	The following table summarizes the changes in the Company’s carrying value of goodwill during the three months ended March 31, 2020 : Balance, December 31, 2019 $ 48,024 Translation adjustments (1) (3,433 ) Balance, March 31, 2020 $ 44,591 (1) The translation adjustment was calculated based on the foreign currency exchange rates as of March 31, 2020 .

Accounts Payable and Accrued _2

Accounts Payable and Accrued Expenses (Tables)	3 Months Ended
	Mar. 31, 2020
Payables and Accruals [Abstract]
Schedule of components of accounts payable and accrued expenses	Below are the components of accounts payable and accrued expenses: March 31, 2020 December 31, 2019 Accounts payable $ 25,659 $ 22,102 Accrued payroll and related expenses 27,546 28,874 Accrued subcontractor fees 8,966 9,405 Accrued agency fees 193 239 Accrued legal and professional fees 1,787 2,169 Other accrued expenses 2,243 2,383 $ 66,394 $ 65,172

Notes Payable and Long-Term D_2

Notes Payable and Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Summary of outstanding debt obligations	The table below reflects the Company's notes payable and long-term debt, which includes credit facilities: Interest Rate (1) Balance Outstanding as of Loan Maturity Interest Rate Type March 31, December 31, March 31, December 31, Secured Credit Facilities Hill International, Inc. - Société Générale 2017 Term Loan Facility 06/20/2023 Variable 7.86% 7.92% $ 29,175 $ 29,250 Hill International, Inc. - Société Générale Domestic Revolving Credit Facility (2) 05/04/2022 Variable 6.18% 6.27% 18,400 9,400 Hill International N.V.. - Société Générale International Revolving Credit Facility (3) 05/04/2022 Variable 4.14% 4.16% 2,811 2,302 Unsecured Credit Facilities Hill International, Inc. - First Abu Dhabi Bank ("FAB") PJSC Overdraft Credit Facility (4) 04/18/2021 Variable 5.79% 5.81% 1,997 593 Hill International Brasil S.A. - Revolving Credit Facility (5) 06/12/2020 Fixed 2.80% 3.24% 386 498 Unsecured Notes Payable and Long-Term Debt Hill International Spain SA-Bankia S.A. & Bankinter S.A.(6) 12/31/2021 Fixed 2.21% 2.21% 907 1,054 Philadelphia Industrial Development Corporation Loan 03/31/2027 Fixed 2.79% 2.79% 466 486 Total notes payable and long-term debt, gross $ 54,142 $ 43,583 Less: unamortized discount and deferred financing costs related to Société Générale 2017 Term Loan Facility (601 ) (641 ) Notes payable and long-term debt $ 53,541 $ 42,942 Current portion of notes payable $ 3,258 $ 1,972 Current portion of unamortized debt discount and deferred financing costs $ (187 ) $ (180 ) Current maturities of notes payable and long-term debt $ 3,071 $ 1,792 Notes payable and long-term debt, net of current maturities $ 50,470 $ 41,150 (1) Interest rates for variable interest rate debt are reflected on a weighted average basis through March 31, 2020 since the loan origination or modification date. (2) As of March 31, 2020 and December 31, 2019 , the Company had $5,100 and $6,548 of outstanding letters of credit, respectively, in addition to the balances outstanding above, which resulted in $1,500 and $9,052 of available borrowing capacity under the Domestic Revolving Credit Facility, respectively. The amounts available were based on the maximum borrowing capacity of $25,000 as of March 31, 2020 and December 31, 2019 . See additional information below related to this secured revolving credit facility. (3) As of March 31, 2020 and December 31, 2019 , the Company had $2,162 and $3,145 of outstanding letters of credit, respectively, in addition to the balances outstanding above, which resulted in $165 and $2,232 of available borrowing capacity under the International Revolving Credit Facility, respectively. The amounts available were based on the Company's borrowing capacity of $5,138 and $7,679 as of March 31, 2020 and December 31, 2019 , respectively. See additional information below related to this secured revolving credit facility. (4) FAB credit facility lender was formerly known as National Bank of Abu Dhabi. There is no stated maturity date, however, the loan is subject to annual review in April of each year, or at any other time as determined by FAB. Therefore, the amount outstanding is reflected within the current maturities of notes payable and long-term debt. Balances outstanding are reflected in U.S. dollars based on the conversion rates from AED as of March 31, 2020 and December 31, 2019 . The Company had $1,134 and $2,538 of availability under the credit facility as of March 31, 2020 and December 31, 2019 , respectively. (5) Unsecured revolving credit facility is subject to automatic renewals on a monthly basis. Effective with the November 2019 renewal of the unsecured revolving credit facility, the interest rate was reduced by the credit facility lender from 3.30% to 2.80% . The Company had no availability under the unsecured credit facility as of March 31, 2020 and December 31, 2019 . The amounts outstanding are based on conversion rates from Brazilian Real as of March 31, 2020 and December 31, 2019 . (6) Balances outstanding are reflected in U.S. dollars based on the conversion rates from Euros as of March 31, 2020 and December 31, 2019 .

Segment and Related Informati_2

Segment and Related Information (Tables)	3 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Schedule of Revenue by Geographic Region	Total Revenue by Geographic Region: Three Months Ended March 31, 2020 2019 United States $ 46,020 49.3 % $ 48,102 48.7 % Latin America 1,171 1.3 % 2,434 2.5 % Europe 11,537 12.4 % 11,334 11.5 % Middle East 24,572 26.3 % 28,311 28.7 % Africa 7,297 7.8 % 6,949 7.0 % Asia/Pacific 2,711 2.9 % 1,553 1.6 % Total $ 93,308 100.0 % $ 98,683 100.0 % Consulting Fee Revenue by Geographic Region: Three Months Ended March 31, 2020 2019 United States $ 34,044 44.2 % $ 32,595 41.2 % Latin America 1,171 1.5 % 2,429 3.1 % Europe 10,581 13.7 % 10,902 13.8 % Middle East 23,413 30.3 % 25,260 32.0 % Africa 6,602 8.6 % 6,411 8.1 % Asia/Pacific 1,339 1.7 % 1,403 1.8 % Total $ 77,150 100.0 % $ 79,000 100.0 %
Schedule of Operating Profit (Loss)	Operating Profit (Loss) by Geographic Region: Three Months Ended 2020 2019 United States (1) $ 7,388 $ 5,742 Latin America (243 ) 277 Europe (1) 1,697 882 Middle East (1) 1,098 5,119 Africa 863 1,610 Asia/Pacific 183 (478 ) Corporate (2) (14,851 ) (12,613 ) Total $ (3,865 ) $ 539 (1) includes Hill's share of loss (profit) of equity method affiliates on the Consolidated Statements of Operations. (2) includes foreign exchange expense (benefit) of $4,051 and $(26) for the three months ended March 31, 2020 and 2019 , respectively.
Schedule of Depreciation and Amortization Expense	Depreciation and Amortization Expense: Three Months Ended 2020 2019 Project Management $ 364 $ 774 Corporate (1) 2,060 17 Total $ 2,424 $ 791 (1) includes $1,582 additional depreciation charge for the write-off of leasehold improvements related to the Company subletting office space in Philadelphia to a third party.
Schedule of Revenue By Client Type	Total Revenue By Client Type: Three Months Ended March 31, 2020 2019 U.S. federal government $ 4,610 4.9 % $ 4,692 4.8 % U.S. state, regional and local governments 30,551 32.7 % 30,895 31.3 % Foreign governments 25,364 27.2 % 25,679 26.0 % Private sector 32,783 35.2 % 37,417 37.9 % Total $ 93,308 100.0 % $ 98,683 100.0 %
Schedule of Property, Plant and Equipment, Net by Geographic Location	Property, Plant and Equipment, Net, by Geographic Location: March 31, 2020 December 31, 2019 United States $ 8,188 $ 9,701 Latin America 525 700 Europe 447 473 Middle East 809 803 Africa 131 139 Asia/Pacific 67 79 Total $ 10,167 $ 11,895

Operating Leases (Tables)

Operating Leases (Tables)	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Maturities of Operating Lease Liabilities	The following is a schedule of maturities of lease liabilities by year as of March 31, 2020 : Total Operating Lease Payments 2020 (excluding the three months ended March 31, 2020) $ 6,628 2021 4,999 2022 4,089 2023 3,321 2024 2,436 Thereafter 4,440 Total minimum lease payments (1) (2) 25,913 Less amount representing imputed interest 4,205 Present value of lease obligations $ 21,708 Weighted average remaining lease term (years) 5.00 Weighted average discount rate 6.97 % (1) Partially includes rent expense amounts payable in various foreign currencies and are based on the foreign currency exchange spot rates as of March 31, 2020 , where applicable. (2) Includes lease agreements and extensions that have been executed, but has not yet commenced, as of March 31, 2020 .

Liquidity (Details)

Liquidity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Liquidity [Line Items]
Cash and cash equivalents	$ 16,083	$ 15,915
Approximate cost reduction	10,000
U.S. Revolver | Letters of credit
Liquidity [Line Items]
Available borrowing capacity	1,500	9,052
Long-term Line of Credit	5,100	6,548
Foreign credit agreements | International Revolver | Revolving credit facility
Liquidity [Line Items]
Available borrowing capacity	1,134	2,538
Foreign credit agreements | Other Foreign Banks | International Revolver | Revolving credit facility
Liquidity [Line Items]
Available borrowing capacity	165	2,232
Long-term Line of Credit	$ 2,162	$ 3,145

Basis of Presentation - Reclass

Basis of Presentation - Reclassification (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amount reclassified		$ 1,192
Repayment of revolving loans	$ (7,836)	(8,662)
Proceeds from revolving loans	18,792	9,854
Total revenue	93,308	98,683
Other income, net	$ 345	$ 0

Basis of Presentation - Concent

Basis of Presentation - Concentration of Credit Risk (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Concentration Risk [Line Items]
Concentration risk	100.00%	100.00%
Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk	100.00%	100.00%
1 Customer | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk	15.00%		17.00%

Basis of Presentation - Restric

Basis of Presentation - Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 16,083	$ 15,915
Cash - restricted	3,489	4,666
Cash - restricted, net of current portion	3,921	4,401
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	$ 23,493	$ 24,982

Basis of Presentation - Antidil

Basis of Presentation - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total number of shares excluded from diluted earnings per common share (in shares)	1,616	1,417
Deferred Stock Units (DSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total number of shares excluded from diluted earnings per common share (in shares)	789	471

Basis of Presentation - Earning

Basis of Presentation - Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss	$ (6,422)	$ (2,068)
Less: net earnings - non-controlling interests	159	67
Net loss attributable to Hill International, Inc.	$ (6,581)	$ (2,135)
Basic weighted average common shares outstanding	56,543	55,946
Effect of dilutive securities:
Diluted weighted average common shares outstanding (in shares)	56,543	55,946
Basic loss per common share - Hill International, Inc. (in dollars per share)	$ (0.12)	$ (0.04)
Diluted loss per common share - Hill International, Inc. (in dollars per share)	$ (0.12)	$ (0.04)
Stock options
Effect of dilutive securities:
Dilutive securities	0	0
Unvested share-based compensation units
Effect of dilutive securities:
Dilutive securities	0	0

Revenue from Contracts with C_3

Revenue from Contracts with Clients - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)segment	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Number of operating segments | segment	1
Revenue recognized	$ 7,861	$ 9,241
Remaining performance obligations	$ 105,370		$ 113,592
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations, expected term	12 months
Remaining performance obligations, percentage	50.00%
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations, expected term	5 years

Revenue from Contracts with C_4

Revenue from Contracts with Clients - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 93,308	$ 98,683
Percent of Total Revenue	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 46,020	$ 48,102
Percent of Total Revenue	49.30%	48.70%
Latin America
Disaggregation of Revenue [Line Items]
Revenue	$ 1,171	$ 2,434
Percent of Total Revenue	1.30%	2.50%
Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 11,537	$ 11,334
Percent of Total Revenue	12.40%	11.50%
Middle East
Disaggregation of Revenue [Line Items]
Revenue	$ 24,572	$ 28,311
Percent of Total Revenue	26.30%	28.70%
Africa
Disaggregation of Revenue [Line Items]
Revenue	$ 7,297	$ 6,949
Percent of Total Revenue	7.80%	7.00%
Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenue	$ 2,711	$ 1,553
Percent of Total Revenue	2.90%	1.60%
Fixed Price
Disaggregation of Revenue [Line Items]
Revenue	$ 17,712	$ 23,736
Fixed Price | United States
Disaggregation of Revenue [Line Items]
Revenue	5,023	3,433
Fixed Price | Latin America
Disaggregation of Revenue [Line Items]
Revenue	1,171	2,016
Fixed Price | Europe
Disaggregation of Revenue [Line Items]
Revenue	6,429	6,051
Fixed Price | Middle East
Disaggregation of Revenue [Line Items]
Revenue	4,883	11,365
Fixed Price | Africa
Disaggregation of Revenue [Line Items]
Revenue	206	571
Fixed Price | Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenue	0	300
T&M
Disaggregation of Revenue [Line Items]
Revenue	75,596	74,947
T&M | United States
Disaggregation of Revenue [Line Items]
Revenue	40,997	44,669
T&M | Latin America
Disaggregation of Revenue [Line Items]
Revenue	0	418
T&M | Europe
Disaggregation of Revenue [Line Items]
Revenue	5,108	5,283
T&M | Middle East
Disaggregation of Revenue [Line Items]
Revenue	19,689	16,946
T&M | Africa
Disaggregation of Revenue [Line Items]
Revenue	7,091	6,378
T&M | Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenue	$ 2,711	$ 1,253

Accounts Receivable - Component

Accounts Receivable - Components of Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Components of accounts receivable
Billed	$ 128,320	$ 132,339
Unbilled	35,122	30,026
Accounts receivable, gross	163,442	162,365
Allowance for doubtful accounts	(55,333)	(58,473)
Accounts receivable, net	108,109	103,892
Customer in Libya
Components of accounts receivable
Billed	32,162	32,864
Affiliated Entity
Components of accounts receivable
Billed	13,895	12,546
Unbilled	11,658	6,888
Accounts receivable, gross	25,553	19,434
Allowance for doubtful accounts	(634)	(658)
Accounts receivable, net	24,919	18,776
Retainage receivables	$ 401	$ 397

Intangible Assets - Acquired (D

Intangible Assets - Acquired (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Summary of acquired intangible assets
Gross Carrying Amount	$ 1,080	$ 1,080
Accumulated Amortization	875	848
Intangible assets, net	205	232
Client relationship
Summary of acquired intangible assets
Gross Carrying Amount	1,080	1,080
Accumulated Amortization	$ 875	$ 848

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 27	$ 114
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Useful life of finite-lived intangible assets	10 years

Intangible Assets - Amortizatio

Intangible Assets - Amortization Expense (Details) $ in Thousands	Mar. 31, 2020USD ($)
Estimated amortization expense of intangible assets for the next five years
2020 (remaining 9 months)	$ 52
2021	51
2022	51
2023	51
2024	$ 0

Goodwill (Details)

Goodwill (Details) - USD ($)	Jul. 01, 2019	Mar. 31, 2020
Goodwill [Roll Forward]
Balance, December 31, 2019		$ 48,024,000
Translation adjustments		(3,433,000)
Balance, March 31, 2020		$ 44,591,000
Goodwill impairment	$ 0

Accounts Payable and Accrued _3

Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Components of accounts payable and accrued expenses
Accounts payable	$ 25,659	$ 22,102
Accrued payroll and related expenses	27,546	28,874
Accrued subcontractor fees	8,966	9,405
Accrued agency fees	193	239
Accrued legal and professional fees	1,787	2,169
Other accrued expenses	2,243	2,383
Accounts payable and accrued expenses, net	$ 66,394	$ 65,172

Notes Payable and Long-Term D_3

Notes Payable and Long-Term Debt - Summary of Outstanding Debt Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 01, 2019	Nov. 30, 2019
Debt Instrument [Line Items]
Total notes payable and long-term debt, gross	$ 54,142	$ 43,583
Less: unamortized discount and deferred financing costs related to Société Générale 2017 Term Loan Facility	(601)	(641)
Notes payable and long-term debt	53,541	42,942
Current portion of notes payable	3,258	1,972
Current portion of unamortized debt discount and deferred financing costs	(187)	(180)
Current maturities of notes payable and long-term debt	3,071	1,792
Notes payable and long-term debt, net of current maturities	$ 50,470	$ 41,150
Hill International, Inc. - Société Générale 2017 Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Variable interest rate	7.86%	7.92%
Total notes payable and long-term debt, gross	$ 29,175	$ 29,250
Hill International, Inc. - Société Générale Domestic Revolving Credit Facility (2) | Secured Debt
Debt Instrument [Line Items]
Variable interest rate	6.18%	6.27%
Total notes payable and long-term debt, gross	$ 18,400	$ 9,400
Hill International N.V.. - Société Générale International Revolving Credit Facility (3) | Secured Debt
Debt Instrument [Line Items]
Variable interest rate	4.14%	4.16%
Total notes payable and long-term debt, gross	$ 2,811	$ 2,302
Hill International, Inc. - First Abu Dhabi Bank (FAB) PJSC Overdraft Credit Facility | Unsecured Debt
Debt Instrument [Line Items]
Variable interest rate	5.79%	5.81%
Total notes payable and long-term debt, gross	$ 1,997	$ 593
Hill International Brasil S.A. - Revolving Credit Facility | Unsecured Debt
Debt Instrument [Line Items]
Fixed interest rate	2.80%	3.24%	2.80%	3.30%
Total notes payable and long-term debt, gross	$ 386	$ 498
Hill International Spain SA - Bankia, S.A. and Bankinter, S.A | Unsecured Debt
Debt Instrument [Line Items]
Fixed interest rate	2.21%	2.21%
Total notes payable and long-term debt, gross	$ 907	$ 1,054
Philadelphia Industrial Development Corporation Loan | Unsecured Debt
Debt Instrument [Line Items]
Fixed interest rate	2.79%	2.79%
Total notes payable and long-term debt, gross	$ 466	$ 486

Notes Payable and Long-Term D_4

Notes Payable and Long-Term Debt - Term Loan Facilities and Revolving Credit Facilities (Details) € in Thousands	3 Months Ended
	Mar. 31, 2020EUR (€)	Apr. 01, 2020EUR (€)	Apr. 01, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 01, 2019	Nov. 30, 2019	May 05, 2017USD ($)
Secured Term Loan
Debt Instrument [Line Items]
Aggregate principal amount								$ 30,000,000
Secured Credit Facilities
Debt Instrument [Line Items]
Debt covenant leverage ratio limit	3
Increase in applicable interest rate upon default	2.00%
Revolving credit facility | Other Assets
Debt Instrument [Line Items]
Unamortized debt issuance costs				$ 1,175,000	$ 1,317,000
Revolving credit facility | Revolving Credit Facility Prior To Amendment
Debt Instrument [Line Items]
Maximum borrowing capacity | €	€ 9,156
U.S. Revolver | Revolving credit facility
Debt Instrument [Line Items]
Aggregate principal amount				25,000,000
Unused facility commitment fees percentage	0.50%
U.S. Revolver | Letters of credit
Debt Instrument [Line Items]
Amounts outstanding				5,100,000	6,548,000
Available borrowing capacity				1,500,000	9,052,000
International Revolver | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity				10,093,000				$ 10,000,000
Unused facility commitment fees percentage	0.75%
International Revolver | Revolving credit facility | Foreign credit agreements
Debt Instrument [Line Items]
Available borrowing capacity				1,134,000	2,538,000
International Revolver | Revolving credit facility | Other Foreign Banks | Foreign credit agreements
Debt Instrument [Line Items]
Amounts outstanding				2,162,000	3,145,000
Available borrowing capacity				165,000	2,232,000
Maximum borrowing capacity				5,138,000	7,679,000
Unsecured Debt | Hill International, Inc. - First Abu Dhabi Bank (FAB) PJSC Overdraft Credit Facility
Debt Instrument [Line Items]
Available borrowing capacity				1,134,000	$ 2,538,000
Unsecured Debt | Hill International Brasil S.A. - Revolving Credit Facility
Debt Instrument [Line Items]
Available borrowing capacity				$ 0
Fixed interest rate	2.80%			2.80%	3.24%	2.80%	3.30%
Subsequent Event | Revolving credit facility | Revolving Credit Facility Prior To Amendment
Debt Instrument [Line Items]
Maximum borrowing capacity | €		€ 5,977
Subsequent Event | U.S. Revolver | Revolving credit facility
Debt Instrument [Line Items]
Aggregate principal amount			$ 28,500,000
Subsequent Event | International Revolver | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 6,593,000

Notes Payable and Long-Term D_5

Notes Payable and Long-Term Debt - Other Financing Arrangements (Details) - USD ($) $ in Thousands	May 01, 2019	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt		$ 53,541	$ 42,942
Other notes payable | Premium Financing Agreement with AFCO Premium Credit LLC
Debt Instrument [Line Items]
Aggregate principal amount	$ 3,032
Down payment	$ 258
Debt term	11 years
Interest rate	4.57%
Long-term debt			$ 768

Share-Based Compensation (Detai

Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 399	$ 241
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options granted (in shares)	723,000	758,000
Number of common stock issuable per each award (in shares)	1
Award vesting period	3 years
Weighted average price per share (in dollars per share)	$ 3.28	$ 3.23
Deferred Stock Units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options granted (in shares)	8,000
Number of common stock issuable per each award (in shares)	1
Weighted average price per share (in dollars per share)	$ 3.18	$ 3.15
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	1,616,000	1,417,000
Weighted average exercise price of outstanding options (in dollars per share)	$ 4.03	$ 4.33
Options lapsed (in shares)	263,000	525,000
Weighted average exercise price of options lapsed (in dollars per share)	$ 3.67	$ 4.42

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Effective income tax rate (as a percent)	(33.30%)	(112.50%)
Reserve for uncertain tax positions	$ 4,582		$ 4,615
Income tax expense related to interest and penalties	$ 3	$ 2

Segment and Related Informati_3

Segment and Related Information - Revenue by Geographic Region (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)segment	Mar. 31, 2019USD ($)
Consulting Fee Revenue and Total Revenue by Geographic Region:
Number of reporting units | segment	1
Total revenue	$ 93,308	$ 98,683
Percent of Total Revenue	100.00%	100.00%
United States
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	$ 46,020	$ 48,102
Percent of Total Revenue	49.30%	48.70%
Latin America
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	$ 1,171	$ 2,434
Percent of Total Revenue	1.30%	2.50%
Europe
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	$ 11,537	$ 11,334
Percent of Total Revenue	12.40%	11.50%
Middle East
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	$ 24,572	$ 28,311
Percent of Total Revenue	26.30%	28.70%
Africa
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	$ 7,297	$ 6,949
Percent of Total Revenue	7.80%	7.00%
Asia/Pacific
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	$ 2,711	$ 1,553
Percent of Total Revenue	2.90%	1.60%
Geographic Concentration Risk
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	100.00%	100.00%
Geographic Concentration Risk | United States
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	49.30%	48.70%
Geographic Concentration Risk | Latin America
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	1.30%	2.50%
Geographic Concentration Risk | Europe
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	12.40%	11.50%
Geographic Concentration Risk | Middle East
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	26.30%	28.70%
Geographic Concentration Risk | Africa
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	7.80%	7.00%
Geographic Concentration Risk | Asia/Pacific
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	2.90%	1.60%
Consulting fee revenue
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	$ 77,150	$ 79,000
Consulting fee revenue | United States
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	34,044	32,595
Consulting fee revenue | Latin America
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	1,171	2,429
Consulting fee revenue | Europe
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	10,581	10,902
Consulting fee revenue | Middle East
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	23,413	25,260
Consulting fee revenue | Africa
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	6,602	6,411
Consulting fee revenue | Asia/Pacific
Consulting Fee Revenue and Total Revenue by Geographic Region:
Total revenue	$ 1,339	$ 1,403
Consulting fee revenue | Geographic Concentration Risk
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	100.00%	100.00%
Consulting fee revenue | Geographic Concentration Risk | United States
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	44.20%	41.20%
Consulting fee revenue | Geographic Concentration Risk | Latin America
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	1.50%	3.10%
Consulting fee revenue | Geographic Concentration Risk | Europe
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	13.70%	13.80%
Consulting fee revenue | Geographic Concentration Risk | Middle East
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	30.30%	32.00%
Consulting fee revenue | Geographic Concentration Risk | Africa
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	8.60%	8.10%
Consulting fee revenue | Geographic Concentration Risk | Asia/Pacific
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of Total Revenue	1.70%	1.80%

Segment and Related Informati_4

Segment and Related Information - Operating Profit (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	$ (3,865)	$ 539
Operating segment | United States
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	7,388	5,742
Operating segment | Latin America
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	(243)	277
Operating segment | Europe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	1,697	882
Operating segment | Middle East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	1,098	5,119
Operating segment | Africa
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	863	1,610
Operating segment | Asia/Pacific
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating profit (loss)	183	(478)
Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Foreign exchange expense	4,051	(26)
Operating profit (loss)	$ (14,851)	$ (12,613)

Segment and Related Informati_5

Segment and Related Information - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Depreciation and Amortization Expense
Depreciation and amortization expense	$ 2,424	$ 791
Operating segment | Project Management
Depreciation and Amortization Expense
Depreciation and amortization expense	364	774
Corporate
Depreciation and Amortization Expense
Depreciation and amortization expense	2,060	$ 17
Leasehold Improvements | Corporate
Depreciation and Amortization Expense
Depreciation and amortization expense	$ 1,582

Segment and Related Informati_6

Segment and Related Information - Revenue by Client Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consulting Fee Revenue and Total Revenue By Client Type:
Total revenue	$ 93,308	$ 98,683
Percent of Total Revenue	100.00%	100.00%
U.S. federal government
Consulting Fee Revenue and Total Revenue By Client Type:
Total revenue	$ 4,610	$ 4,692
U.S. state, regional and local governments
Consulting Fee Revenue and Total Revenue By Client Type:
Total revenue	30,551	30,895
Foreign governments
Consulting Fee Revenue and Total Revenue By Client Type:
Total revenue	25,364	25,679
Private sector
Consulting Fee Revenue and Total Revenue By Client Type:
Total revenue	$ 32,783	$ 37,417
Customer Concentration Risk
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of Total Revenue	100.00%	100.00%
Customer Concentration Risk | U.S. federal government
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of Total Revenue	4.90%	4.80%
Customer Concentration Risk | U.S. state, regional and local governments
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of Total Revenue	32.70%	31.30%
Customer Concentration Risk | Foreign governments
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of Total Revenue	27.20%	26.00%
Customer Concentration Risk | Private sector
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of Total Revenue	35.20%	37.90%

Segment and Related Informati_7

Segment and Related Information - Property, Plant and Equipment, Net by Geographic Location (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	$ 10,167	$ 11,895
United States
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	8,188	9,701
Latin America
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	525	700
Europe
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	447	473
Middle East
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	809	803
Africa
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	131	139
Asia/Pacific
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	$ 67	$ 79

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Feb. 08, 2018	Mar. 31, 2020
Other liabilities
Loss Contingencies [Line Items]
Potential tax liability related to certain foreign subsidiaries		$ 1,196
Performance Guarantee
Loss Contingencies [Line Items]
Loss on performance bond	$ 7,938

Operating Leases - Narrative (D

Operating Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 2,307	$ 1,986
Short-term and variable lease expense	389	292
Sublease income	$ (176)	$ (143)
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal option	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal option	5 years

Operating Leases - Maturities o

Operating Leases - Maturities of Operating Lease Liabilities (Details) $ in Thousands	Mar. 31, 2020USD ($)
Operating leases
2020 (excluding the three months ended March 31, 2020)	$ 6,628
2021	4,999
2022	4,089
2023	3,321
2024	2,436
Thereafter	4,440
Total principal and interest payments	25,913
Less amount representing imputed interest	4,205
Present value of lease obligations	$ 21,708
Weighted average remaining lease term (years)	5 years
Weighted average discount rate	6.97%

Subsequent Events (Details)

Subsequent Events (Details) € in Thousands	Apr. 01, 2020EUR (€)	Apr. 01, 2020USD ($)	Apr. 01, 2020USD ($)	Mar. 31, 2020EUR (€)	Mar. 31, 2020USD ($)	May 05, 2017USD ($)
Revolving credit facility | Revolving Credit Facility Prior To Amendment
Subsequent Events [Line Items]
Maximum borrowing capacity | €				€ 9,156
Revolving credit facility | Revolving Credit Facility Prior To Amendment | Subsequent Event
Subsequent Events [Line Items]
Increase (decrease) in maximum borrowing capacity	€ (3,179)	$ (3,500,000)
Maximum borrowing capacity | €	€ 5,977
International Revolver | Revolving credit facility
Subsequent Events [Line Items]
Maximum borrowing capacity					$ 10,093,000	$ 10,000,000
International Revolver | Revolving credit facility | Subsequent Event
Subsequent Events [Line Items]
Maximum borrowing capacity			$ 6,593,000
U.S. Revolver | Revolving credit facility
Subsequent Events [Line Items]
Aggregate principal amount					$ 25,000,000
U.S. Revolver | Revolving credit facility | Subsequent Event
Subsequent Events [Line Items]
Increase in aggregate principal amount		$ 3,500,000
Aggregate principal amount			$ 28,500,000