Hill International (HIL) 10-Q 7 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 22, 2018
Document and Entity Information
Entity Registrant Name	Hill International, Inc.
Entity Central Index Key	1,287,808
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		55,558,243
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Entity Emerging Growth Company	false
Entity Small Business	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 23,083	$ 21,353
Cash - restricted	4,051	4,407
Accounts receivable, less allowance for doubtful accounts of $68,189 and $72,850	137,927	147,611
Current portion of retainage receivable	18,775	9,249
Accounts receivable - affiliates	5,373	4,599
Prepaid expenses and other current assets	8,427	9,053
Income tax receivable	1,315	2,139
Total current assets	198,951	198,411
Property and equipment, net	11,502	12,004
Cash - restricted, net of current portion	3,261	1,160
Retainage receivable	5,816	13,095
Acquired intangibles, net	2,433	3,908
Goodwill	48,404	52,658
Investments	3,799	3,639
Deferred income tax assets	3,839	4,052
Other assets	4,206	4,368
Total assets	282,211	293,295
Liabilities and Stockholders’ Equity
Current maturities of notes payable and long-term debt	2,986	3,241
Accounts payable and accrued expenses	83,346	83,221
Income taxes payable	8,327	16,494
Current portion of deferred revenue	10,210	13,945
Other current liabilities	9,234	8,973
Total current liabilities	114,103	125,874
Notes payable and long-term debt, net of current maturities	44,843	34,541
Retainage payable	707	599
Deferred income taxes	403	933
Deferred revenue	13,458	7,212
Other liabilities	8,737	13,466
Total liabilities	182,251	182,625
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, 61,840 shares and 59,389 shares issued at September 30, 2018 and December 31, 2017, respectively	6	6
Additional paid-in capital	208,007	197,104
Accumulated deficit	(78,159)	(53,983)
Accumulated other comprehensive loss	(2,278)	(4,011)
Less treasury stock of 6,546 and 6,977 shares at September 30, 2018 and December 31, 2017, respectively	(28,231)	(30,041)
Hill International, Inc. share of equity	99,345	109,075
Noncontrolling interests	615	1,595
Total equity	99,960	110,670
Total liabilities and stockholders’ equity	$ 282,211	$ 293,295

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 68,189	$ 72,850
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	61,840,000	59,389,000
Treasury stock, shares	6,546,000	6,977,000

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 101,935	$ 123,192	$ 327,980	$ 364,748
Direct expenses	68,811	85,875	226,969	251,191
Gross profit	33,124	37,317	101,011	113,557
Selling, general and administrative expenses	41,478	38,945	112,123	112,482
Plus: Share of profit of equity method affiliates	685	0	2,616	48
Less: Loss on performance bond	0	0	7,938	0
Operating profit (loss)	(7,669)	(1,628)	(16,434)	1,123
Interest and related financing fees, net	1,275	1,035	3,855	2,066
Loss before income taxes	(8,944)	(2,663)	(20,289)	(943)
Income tax expense (benefit)	(460)	(1,068)	2,928	(368)
Loss from continuing operations	(8,484)	(1,595)	(23,217)	(575)
Discontinued operations:
Loss from discontinued operations, net of tax	0	(752)	(863)	(12,304)
Gain on disposal of discontinued operations, net of tax	0	(1,892)	0	50,303
Total earnings (loss) from discontinued operations	0	(2,644)	(863)	37,999
Net earnings (loss)	(8,484)	(4,239)	(24,080)	37,424
Less: net earnings - noncontrolling interests	60	55	96	175
Net earnings (loss) attributable to Hill International, Inc.	$ (8,544)	$ (4,294)	$ (24,176)	$ 37,249
Basic loss per common share from continuing operations (in dollars per share)	$ (0.15)	$ (0.03)	$ (0.42)	$ (0.01)
Basic loss per common share from discontinued operations (in dollars per share)	0	(0.01)	(0.02)	(0.24)
Basic gain (loss) on disposal of discontinued operations, net of tax (in dollars per share)	0	(0.04)	0	0.97
Basic earnings (loss) per common share - Hill International, Inc. (in dollars per share)	$ (0.15)	$ (0.08)	$ (0.44)	$ 0.72
Basic weighted average common shares outstanding (in shares)	55,476	52,371	54,466	52,065
Diluted loss per common share from continuing operations (in dollars per share)	$ (0.15)	$ (0.03)	$ (0.42)	$ (0.01)
Diluted loss per common share from discontinued operations (in dollars per share)	0	(0.01)	(0.02)	(0.24)
Diluted gain on disposal of discontinued operations, net of tax (in dollars per share)	0	(0.04)	0	0.97
Diluted earnings (loss) per common share - Hill International, Inc. (in dollars per share)	$ (0.15)	$ (0.08)	$ (0.44)	$ 0.72
Diluted weighted average common shares outstanding (in shares)	55,476	52,371	54,466	52,065

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) EARNINGS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (8,484)	$ (4,239)	$ (24,080)	$ 37,424
Foreign currency translation adjustment, net of tax	673	1,929	1,280	(273)
Comprehensive earnings (loss)	(7,811)	(2,310)	(22,800)	37,151
Less: Comprehensive earnings (loss) attributable to non-controlling interests	52	454	(357)	438
Comprehensive earnings (loss) attributable to Hill International, Inc.	$ (7,863)	$ (2,764)	$ (22,443)	$ 36,713

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net (loss) earnings	$ (24,080)	$ 37,424
Loss from discontinued operations	863	12,304
Gain on sale of discontinued operations, net of taxes	0	(50,303)
Loss from continuing operations	(23,217)	(575)
Adjustments to reconcile net earnings (loss) to net cash provided by (used in):
Depreciation and amortization	3,433	5,011
(Recovery) provision for bad debts	(3,304)	2,350
Amortization of deferred loan fees	77	789
Deferred tax (benefit) provision	(181)	706
Stock based compensation	741	2,671
Loss on sale of assets	0	184
Unrealized foreign exchange losses on intercompany balances	8,496	425
Changes in operating assets and liabilities:
Accounts receivable	12,717	10,490
Accounts receivable - affiliate	(771)	(1,243)
Prepaid expenses and other current assets	1,025	562
Income taxes receivable	550	(566)
Retainage receivable	(2,351)	9,298
Other assets	600	(4,305)
Accounts payable and accrued expenses	188	(7,888)
Income taxes payable	(8,146)	516
Deferred revenue	2,518	(25,061)
Other current liabilities	876	2,131
Retainage payable	116	(326)
Other liabilities	(6,630)	843
Net cash used in continuing operations	(13,263)	(3,988)
Net cash used in discontinued operations	(863)	(10,217)
Net cash used in operating activities	(14,126)	(14,205)
Cash flows from investing activities:
Purchases of business	0	(123)
Purchase of additional interest in Engineering S.A.	(745)	0
Purchase of property and equipment	(2,328)	(1,927)
Proceeds from sale of assets	0	60
Net cash used in investing activities of continuing operations	(3,073)	(1,990)
Net cash provided by investing activities of discontinued operations	0	129,247
Net cash (used in) provided by investing activities	(3,073)	127,257
Cash flows from financing activities:
Payments on term loans	(682)	(75)
Proceeds from term loans	0	30,000
Net borrowings (payments) on revolving loans	10,226	(28,885)
Pay-off and termination of term loan	0	(117,494)
Payments on Philadelphia Industrial Development Corporation loan	(42)	(42)
Dividends paid to noncontrolling interest	0	(18)
Payments of financing fees	0	(4,038)
Proceeds from stock issued under employee stock purchase plan	29	138
Proceeds from exercise of stock options	11,689	1,838
Net cash provided by (used in) financing activities	21,220	(118,576)
Effect of exchange rate changes on cash	(546)	(4,111)
Net increase (decrease) in cash, cash equivalents and restricted cash	3,475	(9,635)
Cash, cash equivalents and restricted cash — beginning of period	26,920	30,262
Cash, cash equivalents and restricted cash — end of period	$ 30,395	$ 20,627

The Company

The Company	9 Months Ended
	Sep. 30, 2018
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.

Liquidity

Liquidity	9 Months Ended
	Sep. 30, 2018
Liquidity [Abstract]
Liquidity	Liquidity At September 30, 2018 our principal sources of liquidity consisted of $23,083 of cash and cash equivalents, $104 of available borrowing capacity under the Domestic Revolving Credit Facility, $4,573 of available borrowing capacity under the International Revolving Credit Facility and $1,640 under other foreign credit agreements. Additional information regarding the Company's credit facilities is set forth in Note 9 - Notes Payable and Long-Term Debt. The Company believes that it has sufficient liquidity to support the reasonably anticipated cash needs of its operations over the next twelve months.

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2018
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 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, 2017 . 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 balance sheet as of December 31, 2017 . The Company adjusted the classification of current portion of retainage receivable from accounts receivable, less allowance for doubtful accounts to a new line item on the balance sheet, "current portion of retainage receivable." Current portion of retainage receivable is reported separately as a result of the Company's adoption of accounting standards update 2014-09, Revenue from Contracts with Customers (Topic 606). As a result, $9,249 was reclassified from accounts receivable, less allowance for doubtful accounts to current portion of retainage receivable to conform with current period reporting. Additionally, a reclassification was made in the presentation of the consolidated statement of cash flows for the nine months ended September 30, 2017 . As a result of the adoption of ASU 2016-18, Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which addresses classification and presentation of changes in restricted cash on the statement of cash flows, the Company included restricted cash in the opening and closing "cash, cash equivalents and restricted cash" balance in this filing on the consolidated statement of cash flows for the nine months ended September 30, 2017 . Construction Claims Group Sale On December 20, 2016, the Company and its subsidiary Hill International N.V. (“Hill N.V.” and, collectively with the Company, the “Sellers”) entered into a Stock Purchase Agreement (as amended on May 3, 2017, the “Agreement”) with Liberty Mergeco, Inc. (the “US Purchaser”) and Liberty Bidco UK Limited (the “UK Purchaser” and, collectively with the US Purchaser, the “Purchasers”) pursuant to which the Purchasers were to acquire the Construction Claims Group by the US Purchaser’s acquisition of all of the stock of Hill International Consulting, Inc. from the Company and the UK Purchaser’s acquisition of all of the stock of Hill International Consulting B.V. from Hill N.V. The Construction Claims Group sale closed on May 5, 2017. For a detailed description of the transaction, see "Note 2 Discontinued Operations" in the Company's 2017 Annual Report on Form 10-K for the year ended December 31, 2017 , filed with the SEC on August 31, 2018 . 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 entitled 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 statement of operations. The impact of foreign exchange on long-term intercompany loans, for which repayment has not been scheduled or planned, 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 investments 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 revenue for the three and nine months ended September 30, 2018 or 2017 . There were 1 and 2 clients who contributed 10% or more to accounts receivable at September 30, 2018 and December 31, 2017, respectively which represents 17% and 34% of the accounts receivable balance at September 30, 2018 and December 31, 2017, 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, client credit worthiness, 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 earnings. 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 footnote 4, "Revenue from Contracts with Customers," for more detail, regarding how the Company recognizes revenue under each of its contractual arrangements. (g) Earnings (loss) per Share Basic earnings 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 stock unit awards using the treasury stock method, if dilutive. The Company has outstanding options to purchase approximately 1,966 shares and 2,079 shares at September 30, 2018 and 2017 , respectively. The Company has 96 deferred stock units outstanding at September 30, 2018 and 2017 . These awards were excluded from the calculation of diluted earnings (loss) per share for the three and nine months ended September 30, 2018 and 2017 because they were antidilutive due to the Company's net loss from continuing operations. The following table provides a reconciliation to net earnings (loss) used in the numerator for earnings (loss) per share from continuing operations attributable to Hill: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Loss from continuing operations $ (8,484 ) $ (1,595 ) $ (23,217 ) $ (575 ) Less: net earnings - noncontrolling interest 60 55 96 175 Net loss from continuing operations attributable to Hill $ (8,544 ) $ (1,650 ) $ (23,313 ) $ (750 ) In 2017, the Company's Board of Directors (the "Board") approved a monthly grant of Company stock valued at $80 per month to the Interim Chief Executive Officer ("ICEO") during his term of service, to be delivered to him after his service as ICEO. There is no circumstance in which these shares will not be issued, therefore, the shares to be issued under this grant are included in the calculation of basic weighted average shares outstanding. Basic shares outstanding for the three and nine months ended September 30, 2018 and 2017 included such shares granted, but not yet delivered, which accumulated to 263 and 81 shares through September 30, 2018 and 2017 , respectively. See Note 11 - Share-Based Compensation for further details of this grant. (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 4 to the consolidated financial statements in Item 8 of Form 10K for the year ended December 31, 2017 filed with the SEC on August 31, 2018 . See update below. Recently Adopted Accounting Pronouncements In May 2014, the FASB issued Accounting Standard Update ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”) or Accounting Standards Codification 606 (“ASC 606”). This ASU supersedes the revenue recognition requirements in FASB ASC 605, Revenue Recognition, and most industry-specific topics. The new guidance identifies how and when entities should recognize revenue. The new rules establish a core principle requiring the recognition of revenue to depict the transfer of promised goods or services to customers in an amount reflecting the consideration to which the entity expects to be entitled in exchange for such goods or services. In connection with this new standard, the FASB has issued several amendments to ASU 2014-09 to provide additional clarification and implementation instructions relating to (i) principal versus agent considerations, (ii) identifying performance obligations and licensing, (iii) narrow-scope improvements and practical expedients and (iv) technical corrections and improvements. However, none of the amendments change the core principle of the guidance in ASU 2014-09. The Company adopted this standard effective January 1, 2018. See Note 4 - Revenue from Contracts with Customers for further information regarding implementation and disclosures. In January 2016, the FASB issued ASU 2016-1, Financial Instruments - Overall (Topic 825-10) , which requires all equity investments to be measured at fair value with changes in fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee). The amendments in this ASU also require an entity to (1) present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments and (2) provide separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements. In addition, the amendments in this pronouncement eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. This ASU was effective for the Company commencing January 1, 2018. The adoption of this ASU did not have a significant impact on the Company’s financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . The primary purpose of the ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic. This ASU’s amendments add or clarify guidance on eight cash flow issues: debt prepayment, settlement of zero-coupon debt instruments, contingent consideration payments, insurance claim proceeds, life insurance proceeds, distributions from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. The Company adopted this ASU effective January 1, 2018 and elected the cumulative interest approach for distributions received from equity method investments. The adoption of this ASU did not have a significant impact on the Company’s financial statements. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory . Under the new standard, an entity is required to recognize the income tax consequences of an intra-entity transfer of an asset (with the exception of inventory) when the transfer occurs. Under previous U.S. GAAP, entities are prohibited from recognizing current and deferred income taxes for an intra-entity transfer until the asset is sold to a third party. Examples of assets that would be affected by the new guidance are intellectual property and property, plant, and equipment. The Company’s adoption of this ASU on January 1, 2018 did not have a material effect on its consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which addresses classification and presentation of changes in restricted cash on the statement of cash flows. The ASU requires an entity’s reconciliation of the beginning-of-period and end-of-period total amounts shown on the statement of cash flows to include in cash and cash equivalents amounts generally described as restricted cash and restricted cash equivalents . The ASU does not define restricted cash or restricted cash equivalents. The Company defines restricted cash as collateral for letters of credit, bonds or guarantees on projects (for further details see Note 4 of the Company's 2017 form 10-K). The Company adopted this ASU on January 1, 2018 which resulted in restricted cash being included in the opening and closing balance of cash and cash equivalents on the cash flow statements. In January 2017, the FASB issued ASU 2017-1, Business Combinations (Topic 805): Clarifying the Definition of a Business , to clarify the definition of a business with the objective of providing a more robust framework to assist management when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted the amendments of this ASU on January, 1 2018 and will apply its provisions prospectively to future business combinations. In May 2017, the FASB issued ASU 2017-9, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting, which clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions The Company adopted this ASU on January 1, 2018 and will prospectively apply its provisions to any future award modifications. In February 2018, the FASB issued ASU No. 2018-3, Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , that clarifies the guidance in ASU No. 2016-1, Financial Instruments-Overall (Subtopic 825-10) related to: Equity Securities without a Readily Determinable Fair Value- Discontinuation, Equity Securities without a Readily Determinable Fair Value- Adjustments, Forward Contracts and Purchased Options, Presentation Requirements for Certain Fair Value Option Liabilities, Fair Value Option Liabilities Denominated in a Foreign Currency and Transition Guidance for Equity Securities without a Readily Determinable Fair Value. The Company adopted this ASU on January 1, 2018 and it did not have a significant impact on its financial statements. Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU 2016-2, Leases (Topic 842), which will require the Company to recognize lease assets and lease liabilities (related to leases previously classified as operating under previous U.S. GAAP) on its consolidated balance sheet for all leases in excess of one year in duration. The ASU will be effective for the Company commencing January 1, 2019. The adoption of this ASU will impact the Company’s financial statements in that all existing leases will be recorded as right-of-use assets and liabilities and the timing and classification of associated lease expenses will change. To ensure timely adoption of the new accounting standard, the Company will engage additional resources to assist with its assessment and implementation of the financial reporting and disclosure processes. The Company also began the assessment process in October 2018 by performing an inventory of domestic real estate leases of which there were approximately 40 as of October 31, 2018. 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, 2020 with early adoption permitted commencing January 1, 2019. The Company is in the process of assessing the impact of this ASU on our consolidated financial statements and disclosures. 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 does not expect the adoption of this guidance to have a material impact on its consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07 , Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting to simplify the accounting for share-based transactions by expanding the scope of Topic 718 from only being applicable to share-based payments to employees to also include share-based payment transactions for acquiring goods and services from nonemployees. As a result, nonemployee share-based transactions will be measured by estimating the fair value of the equity instruments at the grant date, taking into consideration the probability of satisfying performance conditions. This ASU is effective for annual and interim reporting periods beginning after December 15, 2018. Early adoption is permitted. Our equity incentive plans limit share-based awards to employees and directors of the Company, therefore, we do not expect this update to have a material impact on the Company’s 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 is in the process of assessing the impact of this ASU on its consolidated financial statements and but does not expect this update to have a material impact on the Company's consolidated financial statements.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers The Company adopted ASU 2014-09 on January 1, 2018. Under ASC 606, the Company recognizes revenue to depict the transfer of promised goods or services to customers 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 contracts, the Company charges its clients for its costs, including both direct and indirect 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 customer. 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 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 customer. The Company assess contracts quarterly and may recognize any expected future loss before actually incurring the loss. When the Company is expecting to reach the total consideration under the contract, the Company will begin to negotiate a change order. Change Orders and Claims Change orders are modifications of an original contract that effectively change the provisions of the contract without adding new provisions. 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 customer’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. 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 customer. 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 14 - 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 customer, 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 customer 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 and nine months ended September 30, 2018 are as follows: Three Months Ended September 30, 2018 Fixed Price T&M Total Percent of revenue United States $ 2,575 $ 46,544 $ 49,119 48.2 % Latin America 2,751 — 2,751 2.7 % Europe 4,950 5,543 10,493 10.3 % Middle East 11,904 18,785 30,689 30.1 % Africa 621 6,091 6,712 6.6 % Asia/Pacific 782 1,389 2,171 2.1 % Total $ 23,583 $ 78,352 $ 101,935 100.0 % Nine Months Ended September 30, 2018 Fixed Price T&M Total Percent of revenue United States $ 8,436 $ 143,847 $ 152,283 46.4 % Latin America 7,314 1,277 8,591 2.6 % Europe 15,271 15,989 31,260 9.5 % Middle East 45,377 61,066 106,443 32.5 % Africa 1,264 19,015 20,279 6.2 % Asia/Pacific 4,772 4,352 9,124 2.8 % Total $ 82,434 $ 245,546 $ 327,980 100.0 % The Company recognizes revenue when it transfers promised goods or services to customers 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 customer 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 customer 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 customer regarding acknowledgment and/or agreement with the modification, as well as historical experience with the customer 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 customer. 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 customers 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 customer 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 customer. 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. For periods beginning after December 31, 2017, amounts representing contract assets, which were previously included in “Accounts receivable” within the consolidated balance sheets, have been reclassified as “Current portion of retainage 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 sheet. The Company classifies billings in excess of revenue recognized as deferred revenue as current or noncurrent 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 customer payments. The amount of revenue recognized during the three and nine months ended September 30, 2018 that was included in the deferred revenue balance at the beginning of the period was $5,103 and $12,561 , respectively. Remaining Performance Obligations The remaining performance obligations represent the aggregate transaction price of executed contracts with customers 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 September 30, 2018 , the aggregate amount of the transaction price allocated to remaining performance obligations was $95,955 . During the following 12 months, approximately 53% 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	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Accounts Receivable	Accounts Receivable The components of accounts receivable are as follows: September 30, 2018 December 31, 2017 Billed $ 165,966 $ 186,411 Unbilled 40,150 34,050 206,116 220,461 Allowance for doubtful accounts (68,189 ) (72,850 ) Accounts receivable, less allowance for doubtful accounts $ 137,927 $ 147,611 In September 2018, a client directly paid the Libyan government approximately $4,100 in taxes that the Company owed and in return, the Company reduced the client's outstanding accounts receivable balance for the amount paid. The outstanding accounts receivable balance of the client had been fully reserved, therefore, a portion of that reserve was reversed by the $4,100 payment. The reserve reversal was recorded in the second quarter of 2018 due to the fact that the second quarter financial statements had not been issued at the time the payment was made.

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets The following table summarizes the Company’s acquired intangible assets: September 30, 2018 December 31, 2017 Gross Accumulated Gross Accumulated Client relationships $ 7,604 $ 5,442 $ 16,397 $ 12,862 Acquired contract rights — — 1,007 1,007 Trade names 543 272 877 504 Total $ 8,147 $ 5,714 $ 18,281 $ 14,373 Intangible assets, net $ 2,433 $ 3,908 Amortization expense related to intangible assets was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 $ 209 $ 493 $ 784 $ 1,556 The following table presents the estimated amortization expense for the next five years: Estimated Amortization Expense Year ending December 31, 2018 (remaining 3 months) $ 228 2019 912 2020 651 2021 297 2022 232

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill The following table summarizes the changes in the Company’s carrying value of goodwill during 2018 : Balance, December 31, 2017 $ 52,658 Translation adjustments (4,254 ) Balance, September 30, 2018 $ 48,404 Goodwill represents the excess of the purchase price over the fair value of the net assets acquired. Goodwill is subject to an impairment review at a reporting unit level, on an annual basis as of July 1 st of each fiscal year, or when events occur or circumstances change that would indicate potential impairment. The Company has only one reporting unit, and therefore the entire goodwill is allocated to that reporting unit. The Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of the events or circumstances, the Company determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. The Company performed its annual goodwill impairment test at July 1, 2018. Utilizing the two-step impairment test, the Company first assessed the carrying value of goodwill at the reporting unit level based on an estimate of the fair value of the respective reporting unit. Fair value of the reporting unit was estimated using a discounted cash flow analysis consisting of various assumptions, including expectations of future cash flows based on projections or forecasts derived from analysis of business prospects and economic or market trends that may occur, specifically, the Company gave significant consideration for work expected to be completed under existing contracts during the fourth quarter of 2018 or contracts expected to be executed during 2019. We also used these same expectation in a number of valuation models in addition to discounted cash flows, including, the public company method and quoted price method, and ultimately determined the fair value of our reporting unit based on weighted average calculations from these models. Based on the Company’s assessment, we determined that the fair value of our reporting unit exceeds it carrying value, and accordingly, the goodwill associated with the reporting unit is not considered to be impaired at July 1, 2018. The Company recognizes that any changes in our actual fourth quarter 2018 or projected 2019 results could potentially have a material impact on our assessment of goodwill impairment. The Company will continue to monitor the actual performance of its operations against expectations and assess indicators of possible impairment. The valuation of goodwill is subject to a high degree of judgement, uncertainty and complexity. Should any indicators of impairment occur in subsequent periods, the Company will be required to perform an analysis in order to determine whether goodwill is impaired.

Accounts Payable and Accrued Ex

Accounts Payable and Accrued Expenses	9 Months Ended
	Sep. 30, 2018
Payables and Accruals [Abstract]
Accounts Payable and Accrued Expenses	Accounts Payable and Accrued Expenses Below are the components of accounts payable and accrued expenses: September 30, 2018 December 31, 2017 Accounts payable $ 31,520 $ 32,345 Accrued payroll and related expenses 29,557 29,569 Accrued subcontractor fees 13,848 10,814 Accrued agency fees 578 1,671 Accrued legal and professional fees 1,600 2,983 Other accrued expenses 6,243 5,839 $ 83,346 $ 83,221

Notes Payable and Long-Term Deb

Notes Payable and Long-Term Debt	9 Months Ended
	Sep. 30, 2018
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 September 30, December 31, September 30, December 31, Secured Credit Facilities Hill International, Inc. - Société Générale 2017 Term Loan Facility 06/20/2023 Variable 7.48% 7.32% $ 29,625 $ 29,850 Hill International, Inc. - Société Générale Domestic Revolving Credit Facility 05/04/2022 Variable 6.13% 5.25% 14,400 3,300 Hill International N.V.. - Société Générale International Revolving Credit Facility 05/04/2022 Variable N/A 4.10% — — Unsecured Credit Facilities Hill International, Inc. - First Abu Dhabi Bank PJSC Overdraft Credit Facility (2) 11/30/2018 Variable 5.50% 5.50% 2,078 2,316 Engineering SA Services Technicos - Consortium of Brazilian Credit Facilities (3) 12/07/2018 Fixed 4.76% 4.76% — — Unsecured Notes Payable and Long-Term Debt Hill International Spain SA-Bankia S.A. & Bankinter S.A.(4) 12/31/2021 Fixed 2.17% 2.17% 1,745 2,202 Hill International Spain SA - IberCaja Banco. S.A. (4) 12/31/2019 Variable 3.42% 3.37% 250 407 Philadelphia Industrial Development Corporation Loan 03/31/2027 Fixed 2.75% 2.75% 556 599 Total notes payable and long-term debt, gross $ 48,654 $ 38,674 Less: unamortized discount and deferred financing costs related to Société Générale 2017 Term Loan Facility (825 ) (892 ) Notes payable and long-term debt $ 47,829 $ 37,782 Current portion of notes payable 3,159 3,406 Current portion of unamortized debt discount and deferred financing costs (173 ) (165 ) Current maturities of notes payable and long-term debt 2,986 3,241 Notes payable and long-term debt, net of current maturities 44,843 34,541 (1) Interest rates for variable interest rate debt are reflected on a weighted average basis through September 30, 2018 since inception. (2) Credit facility lender was formerly known as National Bank of Abu Dhabi. There is no stated maturity date as the loan is subject to periodic review by the bank. 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 September 30, 2018 and December 31, 2017 . (3) The unsecured Engineering SA Services revolving credit facilities are held with two banks in Brazil and are subject to automatic renewal on a monthly basis with varying terms. The borrowing availability is based on conversion rates from Brazilian Real. (4) Balances outstanding are reflected in U.S. dollars based on the conversion rates from Euros as of September 30, 2018 and December 31, 2017 . Secured Credit Facilities On May 5, 2017 the Company entered into a credit agreement with Société Générale (the “Agent”) and other U.S. Loan Parties (the “U.S. Lenders”) consisting of (1) a $30,000 term loan (the "2017 Term Loan Facility"); (2) a $25,000 U.S. dollar-denominated revolving credit facility (the “Domestic Revolving Credit Facility”, together with the 2017 Term Loan Facility, the “U.S. Credit Facilities”); and (3) a credit agreement with the Agent (the “International Lender”) providing a €9,156 ( $10,000 at closing) revolving credit facility (the “International Revolving Credit Facility” and together with the Domestic Revolving Credit Facility, the “Revolving Credit Facilities” and, together with the U.S. Credit Facilities, the “Secured Credit Facilities”) which is available to Hill International N.V. The Domestic Revolving Credit Facility and the International Revolving Credit Facility include sub-limits for letters of credit amounting to $20,000 and €8,000 ( $9,130 at closing), respectively. 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 calculation for the September 30, 2018 test date. The U.S. Credit Facilities are guaranteed by certain U.S. subsidiaries of the Company, and the International Revolver is guaranteed by the Company and certain of the Company’s U.S. and non-U.S. subsidiaries. 2017 Term Loan Facility On June 21, 2017, the Company entered into the 2017 Term Loan Facility with a term of 6 years, requiring repayment of 1.0% of the original principal amount annually for the first five years. Any amounts repaid on the 2017 Term Loan Facility will not be available to be re-borrowed. The 2017 Term Loan Facility (along with interest thereon) is generally secured by a first-priority security interest in substantially all assets of the Company and certain of the Company’s U.S. subsidiaries other than accounts receivable and cash proceeds thereof, as to which the 2017 Term Loan Facility (and the interest thereon) is secured by a second-priority security interest. Revolving Credit Facilities The Domestic Revolving Credit Facility and the International Revolving Credit Facility provide for letter of credit sub-limits in amounts of $20,000 and €8,000 ( $9,288 at September 30, 2018 ), respectively. The maximum Consolidated Net Leverage Ratio is 3.00 to 1.00 under the Revolving Credit Facilities for all test dates. The Revolving Credit Facilities require payment of interest only during the term and may be repaid in whole or in part at any time, without premium or penalty, subject to certain customary limitations, and will be available to be re-borrowed from time to time through the maturity date. The unamortized debt issuance costs of $2,019 and $2,400 are included in other assets in the consolidated balance sheet at September 30, 2018 and December 31, 2017 , respectively. The interest rate on borrowings under the Domestic Revolving Credit Facility are, at the Company’s option, either the LIBOR rate for the relevant interest period plus 3.75% per annum or the Base Rate plus 2.75% per annum. The interest rate on borrowings under the International Revolving Credit Facility will be the European Inter-Bank Offered Rate, or “EURIBOR,” for the relevant interest period (or at a substitute rate to be determined to the extent EURIBOR is not available) plus 4.50% per annum. On June 21, 2017, borrowings under the International Revolving Credit Facility were paid in full and there have not been any subsequent borrowings through September 30, 2018 . 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. At September 30, 2018 the Company had $9,828 of outstanding letters of credit and $104 of available borrowing capacity under the Domestic Revolving Credit Facility. At September 30, 2018 , the Company had $2,617 of outstanding letters of credit and $4,573 of available borrowing capacity under the International Revolving Credit Facility. The availability under the International Revolving Credit Facility was reduced from the maximum borrowing capacity of €9,156 ( $10,630 as of September 30, 2018 ) to €6,193 ( $7,190 as of September 30, 2018 ). Other Financing Arrangements On May 1, 2018 , the Company entered into a commercial premium financing agreement for the renewal of its corporate insurance policies with AFCO Premium Credit LLC ("AFCO") for $2,471 . The terms of the arrangement include a $260 down payment, followed by monthly payments to be made over a ten month period at a 4.57% interest rate through February 28, 2019 . On July 25, 2018 , the Company entered into another financing agreement with AFCO for $86 for the renewal of additional corporate insurance policies. The terms of the arrangement include monthly payments to be made over seven months at a 4.57% interest rate through February 28, 2019 . As of September 30, 2018 , the balances payable to AFCO for these arrangements was $1,178 and is reflected in other current liabilities on the consolidated balance sheets.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	9 Months Ended
	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information The following table provides additional cash flow information: Nine Months Ended September 30, 2018 2017 Interest and related financing fees paid $ 3,652 $ 5,831 Income taxes paid $ 11,435 $ 7,713 Increase (decrease) in other current liabilities and decrease (increase) in additional paid-in capital related to ESA Put Options $ — $ (777 ) Increase in additional paid-in capital from the issuance of shares of common stock from cashless exercise of stock options $ 202 $ —

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation At September 30, 2018 , the Company had approximately 1,966 options outstanding with a weighted average exercise price of $4.35 . The Company did not grant any stock options during the nine months ended September 30, 2018 . During the nine months ended September 30, 2018 , options for approximately 928 shares with a weighted average exercise price of $5.77 lapsed and options for approximately 285 shares with a weighted average exercise price of $4.66 were forfeited. Pursuant to the Company’s 2008 Employee Stock Purchase Plan (the "Plan"), employees purchased approximately 6 common shares, for an aggregate purchase price of approximately $29 during the nine months ended September 30, 2018 . There were no common shares purchased under the Plan during the three months ended September 30, 2018 . During the three and nine months ended September 30, 2017 , employees purchased approximately 5 and 36 common shares for an aggregate purchase price of approximately $24 and $138 , respectively, under the Plan. The Company recognized share-based compensation expense in selling, general and administrative expenses in the consolidated statement of operations totaling approximately $1,048 for the three months ended September 30, 2017 , and approximately $737 and $2,261 for the nine months ended September 30, 2018 and 2017 , respectively. During the three months ended September 30, 2018 , the Company recognized a cumulative net compensation expense reduction of $47 as a result of the remeasurement described below. On May 10, 2017, the Board approved a monthly grant of Company stock valued at $80 per month to the Interim Chief Executive Officer ("ICEO") during his term of service. At the end of each month during such period, the ICEO is entitled to $80 worth of Company stock based on the closing price of the Company's common stock on the last trading day of the month. During the three and nine months ended September 30, 2018 , the ICEO accumulated an additional 53 and 138 shares, respectively. The value of the shares accumulated is remeasured each reporting period. The change in value from the previous reporting period is recorded as an adjustment to compensation expense. The remeasurement of the value of the total accumulated shares of this grant during the three months ended September 30, 2018 reduced compensation expense of $162 and increased compensation expense by $399 for the three and nine months ended September 30, 2018 , respectively, and is included in the net share-based compensation expense total reflected above. The ICEO's term of service ended on October 1, 2018 at which time the ICEO had accumulated a total of 263 shares under this program. On August 17, 2018, the Board approved the termination of Raouf S. Ghali’s (current CEO), former Employment Agreement, and the Company and Mr. Ghali entered into a written termination agreement with respect to his former Employment Agreement. Further, the Board approved the following new compensation terms, also effective October 1, 2018: (1) Base Salary of $650,000 annually; (2) Participation in the Company’s Annual Incentive Bonus Plan with an annual target cash bonus of $675,000 , based on metrics to be determined by the Board; (3) Grant of $900,000 annually in shares of the Company’s common stock, 50% of which will be performance based (as determined by the Board) and 50% of which will be time vested; and (4) Participation in the Company’s 2016 Executive Retention Plan, pursuant to which Mr. Ghali will be entitled to severance equal to two times his annual base salary under certain circumstances.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2018
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity The following table summarizes the changes in stockholders’ equity during the nine months ended September 30, 2018 : Total Hill International, Inc. Stockholders Noncontrolling Interest Stockholders’ equity, December 31, 2017 $ 110,670 $ 109,075 $ 1,595 Net (loss) earnings (24,080 ) (24,176 ) 96 Other comprehensive earnings (loss) 1,280 1,733 (453 ) Comprehensive loss (22,800 ) (22,443 ) (357 ) Additional paid in capital 399 399 — Exercise of stock options 11,691 11,691 — Reversal of accrual for portion of ESA Put 745 745 — Acquisition of additional interest in ESA (745 ) (122 ) (623 ) Stockholders’ equity, September 30, 2018 $ 99,960 $ 99,345 $ 615

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
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 September 30, 2018 and 2017 were 5.1% and 40.1% , respectively and the effective tax rates for the nine months ended September 30, 2018 and 2017 were (14.4)% and 39.0% , respectively. The Company’s effective tax rate for the three and nine month ended September 30, 2018 is lower than the comparable periods of 2017 , 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 2017 Tax Act reduced the U.S. statutory tax rate from 35% to 21% beginning in 2018. The 2017 Tax Act requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and introduces a new U.S. tax on certain off-shore earnings referred to as Global Intangible Low-Taxed Income (GILTI) beginning in 2018. The Company is applying the guidance issued by the Securities and Exchange Commission in Staff Accounting Bulletin 118 when accounting for the enactment-date effects of the 2017 Tax Act. The guidance provides for a measurement period up to one year in which provisional amounts may be adjusted as an income tax expense or benefit in the period the adjustment is determined. As of September 30, 2018 , the Company has not completed its accounting for the tax effects of the 2017 Tax Act and the provisional amounts recorded at December 31, 2017 were not adjusted during the quarter ended September 30, 2018 . The Company will continue to analyze the impact of the 2017 Tax Act during the accounting measurement period. The Company’s actual results may materially differ from the Company’s current estimates due to, among other things, further guidance that may be issued by U.S. tax authorities or regulatory bodies to interpret the 2017 Tax Act. US GAAP allows companies to adopt an accounting policy to either recognize deferred taxes for GILTI or treat as a period cost in the year incurred. The Company has not yet determined its tax accounting policy and the Company has included in its calculation of current US income tax expense(benefit), an amount related to its estimate of 2018 current year GILTI. The reserve for uncertain tax positions amounted to $2,587 and $2,676 at September 30, 2018 and December 31, 2017 , respectively, and is included in “Other liabilities” in the consolidated balance sheet at those dates. The Company’s policy is to record income tax related interest and penalties in income tax expense. There were no such items for the three and nine months ended September 30, 2018 and 2017. 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	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment and Related Information	Segment and Related Information The Company operates as one reporting segment, the Project Management Group, which reflects how the Company is managed. The Project Management Group 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 the Project Management Group’s operations: Revenue by Geographic Region: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 United States $ 49,119 48.2 % $ 59,640 48.4 % $ 152,283 46.4 % 169,229 46.4 % Latin America 2,751 2.7 % 2,889 2.3 % 8,591 2.6 % 9,189 2.5 % Europe 10,493 10.3 % 10,811 8.8 % 31,260 9.5 % 30,931 8.5 % Middle East 30,689 30.1 % 42,248 34.3 % 106,443 32.5 % 131,211 36.0 % Africa 6,712 6.6 % 6,034 4.9 % 20,279 6.2 % 17,651 4.8 % Asia/Pacific 2,171 2.1 % 1,570 1.3 % 9,124 2.8 % 6,537 1.8 % Total $ 101,935 100.0 % $ 123,192 100.0 % $ 327,980 100.0 % $ 364,748 100.0 % For the three and nine months ended September 30, 2018 , the United States and United Arab Emirates were the only countries to account for 10% or more of consolidated total revenue. For the three and nine months ended September 30, 2017, the United States was the only country to account for 10% or more of consolidated total revenue. Operating Profit (Loss): Three Months Ended Nine Months Ended 2018 2017 2018 2017 United States $ 6,422 $ 6,350 $ 20,202 $ 17,730 Latin America (413 ) 88 (2,127 ) (2,431 ) Europe * (1,084 ) (57 ) (1,644 ) 3,763 Middle East * 2,846 4,042 3,017 15,402 Africa 806 180 5,873 (533 ) Asia/Pacific * 297 (658 ) (191 ) (1,106 ) Corporate (16,543 ) (11,573 ) (41,564 ) (31,702 ) Total $ (7,669 ) $ (1,628 ) $ (16,434 ) $ 1,123 * includes Hill's share of loss (profit) of equity method affiliates on the Consolidated Statements of Operations. Depreciation and Amortization Expense: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Project Management $ 762 $ 1,422 $ 2,793 $ 4,397 Corporate 164 334 640 614 Total $ 926 $ 1,756 $ 3,433 $ 5,011 Revenue By Client Type: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 U.S. federal government $ 4,329 4.2 % $ 3,729 3.0 % $ 12,124 3.7 % $ 10,965 3.0 % U.S. state, regional and local governments 34,047 33.4 % 43,177 35.0 % 103,759 31.6 % 119,132 32.7 % Foreign governments 27,039 26.5 % 33,524 27.2 % 94,476 28.8 % 105,546 28.9 % Private sector 36,520 35.9 % 42,762 34.8 % 117,621 35.9 % 129,105 35.4 % Total $ 101,935 100.0 % $ 123,192 100.0 % $ 327,980 100.0 % $ 364,748 100.0 % Property, Plant and Equipment, Net, by Geographic Location: September 30, 2018 December 31, 2017 United States $ 9,132 $ 9,434 Latin America 713 546 Europe 535 675 Middle East 967 1,164 Africa 95 105 Asia/Pacific 60 80 Total $ 11,502 $ 12,004

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
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. The Company is evaluating the impact of the judgment of the Court. In September 2017, the Board appointed a special committee of independent directors (the “Special Committee”) to conduct a review of the need for, and causes of, the restatement of the Company’s financial statements. The review was performed with the assistance of independent outside counsel and was completed in April 2018. The review discovered facts that indicated certain former employees of the Company violated Company policies related to accounting for foreign currency exchange transactions. The Company self-reported these facts to the SEC in April 2018 and received a subpoena from the SEC in June 2018. The Company has cooperated and continues to cooperate with the SEC with respect to the SEC’s investigation. Loss on Performance Bond The Company is often required to provide a Performance Guarantee to our customers on projects. The guarantees provide monetary compensation to the customer should we fail to perform our obligations under the contract. Some of these Performance Guarantees are unconditional in that the customer can request and receive payment at any time, for any reason. Historically, payments have not been unconditionally claimed from our customers. Performance Guarantee claims made by customers could have a material adverse impact on our business, financial condition, results of operations, and cash flows. 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. The Company has filed an appeal before the Kuwait Court of Appeals. As a result of the First Instance Court decision, 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. 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 $882 and is included in other liabilities in the consolidated balance sheet at September 30, 2018 .

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2018
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 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, 2017 . 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	Reclassification A reclassification was made in the presentation of the consolidated balance sheet as of December 31, 2017 . The Company adjusted the classification of current portion of retainage receivable from accounts receivable, less allowance for doubtful accounts to a new line item on the balance sheet, "current portion of retainage receivable." Current portion of retainage receivable is reported separately as a result of the Company's adoption of accounting standards update 2014-09, Revenue from Contracts with Customers (Topic 606). As a result, $9,249 was reclassified from accounts receivable, less allowance for doubtful accounts to current portion of retainage receivable to conform with current period reporting. Additionally, a reclassification was made in the presentation of the consolidated statement of cash flows for the nine months ended September 30, 2017 . As a result of the adoption of ASU 2016-18, Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which addresses classification and presentation of changes in restricted cash on the statement of cash flows, the Company included restricted cash in the opening and closing "cash, cash equivalents and restricted cash" balance in this filing on the consolidated statement of cash flows for the nine months ended September 30, 2017 .
Construction Claims Group Sale	Construction Claims Group Sale On December 20, 2016, the Company and its subsidiary Hill International N.V. (“Hill N.V.” and, collectively with the Company, the “Sellers”) entered into a Stock Purchase Agreement (as amended on May 3, 2017, the “Agreement”) with Liberty Mergeco, Inc. (the “US Purchaser”) and Liberty Bidco UK Limited (the “UK Purchaser” and, collectively with the US Purchaser, the “Purchasers”) pursuant to which the Purchasers were to acquire the Construction Claims Group by the US Purchaser’s acquisition of all of the stock of Hill International Consulting, Inc. from the Company and the UK Purchaser’s acquisition of all of the stock of Hill International Consulting B.V. from Hill N.V. The Construction Claims Group sale closed on May 5, 2017. For a detailed description of the transaction, see "Note 2 Discontinued Operations" in the Company's 2017 Annual Report on Form 10-K for the year ended December 31, 2017 , filed with the SEC on August 31, 2018 .
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 entitled 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 statement of operations. The impact of foreign exchange on long-term intercompany loans, for which repayment has not been scheduled or planned, 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 investments 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 revenue for the three and nine months ended September 30, 2018 or 2017 . There were 1 and 2 clients who contributed 10% or more to accounts receivable at September 30, 2018 and December 31, 2017, respectively which represents 17% and 34% of the accounts receivable balance
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, client credit worthiness, 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	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. 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 footnote 4, "Revenue from Contracts with Customers," for more detail, regarding how the Company recognizes revenue under each of its contractual arrangements.
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 earnings. 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.
Earnings (loss) per Share	Earnings (loss) per Share Basic earnings 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 stock unit awards using the treasury stock method, if dilutive. The Company has outstanding options to purchase approximately 1,966 shares and 2,079 shares at September 30, 2018 and 2017 , respectively. The Company has 96 deferred stock units outstanding at September 30, 2018 and 2017 . These awards were excluded from the calculation of diluted earnings (loss) per share for the three and nine months ended September 30, 2018 and 2017 because they were antidilutive due to the Company's net loss from continuing operations. The following table provides a reconciliation to net earnings (loss) used in the numerator for earnings (loss) per share from continuing operations attributable to Hill: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Loss from continuing operations $ (8,484 ) $ (1,595 ) $ (23,217 ) $ (575 ) Less: net earnings - noncontrolling interest 60 55 96 175 Net loss from continuing operations attributable to Hill $ (8,544 ) $ (1,650 ) $ (23,313 ) $ (750 ) In 2017, the Company's Board of Directors (the "Board") approved a monthly grant of Company stock valued at $80 per month to the Interim Chief Executive Officer ("ICEO") during his term of service, to be delivered to him after his service as ICEO. There is no circumstance in which these shares will not be issued, therefore, the shares to be issued under this grant are included in the calculation of basic weighted average shares outstanding. Basic shares outstanding for the three and nine months ended September 30, 2018 and 2017 included such shares granted, but not yet delivered, which accumulated to 263 and 81 shares through September 30, 2018 and 2017 , respectively. See Note 11 - Share-Based Compensation for further details of this grant.
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 4 to the consolidated financial statements in Item 8 of Form 10K for the year ended December 31, 2017 filed with the SEC on August 31, 2018 . See update below. Recently Adopted Accounting Pronouncements In May 2014, the FASB issued Accounting Standard Update ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”) or Accounting Standards Codification 606 (“ASC 606”). This ASU supersedes the revenue recognition requirements in FASB ASC 605, Revenue Recognition, and most industry-specific topics. The new guidance identifies how and when entities should recognize revenue. The new rules establish a core principle requiring the recognition of revenue to depict the transfer of promised goods or services to customers in an amount reflecting the consideration to which the entity expects to be entitled in exchange for such goods or services. In connection with this new standard, the FASB has issued several amendments to ASU 2014-09 to provide additional clarification and implementation instructions relating to (i) principal versus agent considerations, (ii) identifying performance obligations and licensing, (iii) narrow-scope improvements and practical expedients and (iv) technical corrections and improvements. However, none of the amendments change the core principle of the guidance in ASU 2014-09. The Company adopted this standard effective January 1, 2018. See Note 4 - Revenue from Contracts with Customers for further information regarding implementation and disclosures. In January 2016, the FASB issued ASU 2016-1, Financial Instruments - Overall (Topic 825-10) , which requires all equity investments to be measured at fair value with changes in fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee). The amendments in this ASU also require an entity to (1) present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments and (2) provide separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements. In addition, the amendments in this pronouncement eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. This ASU was effective for the Company commencing January 1, 2018. The adoption of this ASU did not have a significant impact on the Company’s financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . The primary purpose of the ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic. This ASU’s amendments add or clarify guidance on eight cash flow issues: debt prepayment, settlement of zero-coupon debt instruments, contingent consideration payments, insurance claim proceeds, life insurance proceeds, distributions from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. The Company adopted this ASU effective January 1, 2018 and elected the cumulative interest approach for distributions received from equity method investments. The adoption of this ASU did not have a significant impact on the Company’s financial statements. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory . Under the new standard, an entity is required to recognize the income tax consequences of an intra-entity transfer of an asset (with the exception of inventory) when the transfer occurs. Under previous U.S. GAAP, entities are prohibited from recognizing current and deferred income taxes for an intra-entity transfer until the asset is sold to a third party. Examples of assets that would be affected by the new guidance are intellectual property and property, plant, and equipment. The Company’s adoption of this ASU on January 1, 2018 did not have a material effect on its consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which addresses classification and presentation of changes in restricted cash on the statement of cash flows. The ASU requires an entity’s reconciliation of the beginning-of-period and end-of-period total amounts shown on the statement of cash flows to include in cash and cash equivalents amounts generally described as restricted cash and restricted cash equivalents . The ASU does not define restricted cash or restricted cash equivalents. The Company defines restricted cash as collateral for letters of credit, bonds or guarantees on projects (for further details see Note 4 of the Company's 2017 form 10-K). The Company adopted this ASU on January 1, 2018 which resulted in restricted cash being included in the opening and closing balance of cash and cash equivalents on the cash flow statements. In January 2017, the FASB issued ASU 2017-1, Business Combinations (Topic 805): Clarifying the Definition of a Business , to clarify the definition of a business with the objective of providing a more robust framework to assist management when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted the amendments of this ASU on January, 1 2018 and will apply its provisions prospectively to future business combinations. In May 2017, the FASB issued ASU 2017-9, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting, which clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions The Company adopted this ASU on January 1, 2018 and will prospectively apply its provisions to any future award modifications. In February 2018, the FASB issued ASU No. 2018-3, Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , that clarifies the guidance in ASU No. 2016-1, Financial Instruments-Overall (Subtopic 825-10) related to: Equity Securities without a Readily Determinable Fair Value- Discontinuation, Equity Securities without a Readily Determinable Fair Value- Adjustments, Forward Contracts and Purchased Options, Presentation Requirements for Certain Fair Value Option Liabilities, Fair Value Option Liabilities Denominated in a Foreign Currency and Transition Guidance for Equity Securities without a Readily Determinable Fair Value. The Company adopted this ASU on January 1, 2018 and it did not have a significant impact on its financial statements. Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU 2016-2, Leases (Topic 842), which will require the Company to recognize lease assets and lease liabilities (related to leases previously classified as operating under previous U.S. GAAP) on its consolidated balance sheet for all leases in excess of one year in duration. The ASU will be effective for the Company commencing January 1, 2019. The adoption of this ASU will impact the Company’s financial statements in that all existing leases will be recorded as right-of-use assets and liabilities and the timing and classification of associated lease expenses will change. To ensure timely adoption of the new accounting standard, the Company will engage additional resources to assist with its assessment and implementation of the financial reporting and disclosure processes. The Company also began the assessment process in October 2018 by performing an inventory of domestic real estate leases of which there were approximately 40 as of October 31, 2018. 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, 2020 with early adoption permitted commencing January 1, 2019. The Company is in the process of assessing the impact of this ASU on our consolidated financial statements and disclosures. 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 does not expect the adoption of this guidance to have a material impact on its consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07 , Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting to simplify the accounting for share-based transactions by expanding the scope of Topic 718 from only being applicable to share-based payments to employees to also include share-based payment transactions for acquiring goods and services from nonemployees. As a result, nonemployee share-based transactions will be measured by estimating the fair value of the equity instruments at the grant date, taking into consideration the probability of satisfying performance conditions. This ASU is effective for annual and interim reporting periods beginning after December 15, 2018. Early adoption is permitted. Our equity incentive plans limit share-based awards to employees and directors of the Company, therefore, we do not expect this update to have a material impact on the Company’s 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 is in the process of assessing the impact of this ASU on its consolidated financial statements and but does not expect this update to have a material impact on the Company's consolidated financial statements.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Earnings Per Share	The following table provides a reconciliation to net earnings (loss) used in the numerator for earnings (loss) per share from continuing operations attributable to Hill: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Loss from continuing operations $ (8,484 ) $ (1,595 ) $ (23,217 ) $ (575 ) Less: net earnings - noncontrolling interest 60 55 96 175 Net loss from continuing operations attributable to Hill $ (8,544 ) $ (1,650 ) $ (23,313 ) $ (750 )

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2018
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 and nine months ended September 30, 2018 are as follows: Three Months Ended September 30, 2018 Fixed Price T&M Total Percent of revenue United States $ 2,575 $ 46,544 $ 49,119 48.2 % Latin America 2,751 — 2,751 2.7 % Europe 4,950 5,543 10,493 10.3 % Middle East 11,904 18,785 30,689 30.1 % Africa 621 6,091 6,712 6.6 % Asia/Pacific 782 1,389 2,171 2.1 % Total $ 23,583 $ 78,352 $ 101,935 100.0 % Nine Months Ended September 30, 2018 Fixed Price T&M Total Percent of revenue United States $ 8,436 $ 143,847 $ 152,283 46.4 % Latin America 7,314 1,277 8,591 2.6 % Europe 15,271 15,989 31,260 9.5 % Middle East 45,377 61,066 106,443 32.5 % Africa 1,264 19,015 20,279 6.2 % Asia/Pacific 4,772 4,352 9,124 2.8 % Total $ 82,434 $ 245,546 $ 327,980 100.0 %

Accounts Receivable (Tables)

Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Schedule of components of accounts receivable	The components of accounts receivable are as follows: September 30, 2018 December 31, 2017 Billed $ 165,966 $ 186,411 Unbilled 40,150 34,050 206,116 220,461 Allowance for doubtful accounts (68,189 ) (72,850 ) Accounts receivable, less allowance for doubtful accounts $ 137,927 $ 147,611 In September 2018, a client directly paid the Libyan government approximately $4,100 in taxes that the Company owed and in return, the Company reduced the client's outstanding accounts receivable balance for the amount paid. The outstanding accounts receivable balance of the client had been fully reserved, therefore, a portion of that reserve was reversed by the $4,100 payment. The reserve reversal was recorded in the second quarter of 2018 due to the fact that the second quarter financial statements had not been issued at the time the payment was made.

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of acquired intangible assets	The following table summarizes the Company’s acquired intangible assets: September 30, 2018 December 31, 2017 Gross Accumulated Gross Accumulated Client relationships $ 7,604 $ 5,442 $ 16,397 $ 12,862 Acquired contract rights — — 1,007 1,007 Trade names 543 272 877 504 Total $ 8,147 $ 5,714 $ 18,281 $ 14,373 Intangible assets, net $ 2,433 $ 3,908
Summary of amortization expense related to intangible assets	Amortization expense related to intangible assets was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 $ 209 $ 493 $ 784 $ 1,556
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, 2018 (remaining 3 months) $ 228 2019 912 2020 651 2021 297 2022 232

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2018
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 2018 : Balance, December 31, 2017 $ 52,658 Translation adjustments (4,254 ) Balance, September 30, 2018 $ 48,404

Accounts Payable and Accrued _2

Accounts Payable and Accrued Expenses (Tables)	9 Months Ended
	Sep. 30, 2018
Payables and Accruals [Abstract]
Schedule of components of accounts payable and accrued expenses	Below are the components of accounts payable and accrued expenses: September 30, 2018 December 31, 2017 Accounts payable $ 31,520 $ 32,345 Accrued payroll and related expenses 29,557 29,569 Accrued subcontractor fees 13,848 10,814 Accrued agency fees 578 1,671 Accrued legal and professional fees 1,600 2,983 Other accrued expenses 6,243 5,839 $ 83,346 $ 83,221

Notes Payable and Long-Term D_2

Notes Payable and Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2018
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 September 30, December 31, September 30, December 31, Secured Credit Facilities Hill International, Inc. - Société Générale 2017 Term Loan Facility 06/20/2023 Variable 7.48% 7.32% $ 29,625 $ 29,850 Hill International, Inc. - Société Générale Domestic Revolving Credit Facility 05/04/2022 Variable 6.13% 5.25% 14,400 3,300 Hill International N.V.. - Société Générale International Revolving Credit Facility 05/04/2022 Variable N/A 4.10% — — Unsecured Credit Facilities Hill International, Inc. - First Abu Dhabi Bank PJSC Overdraft Credit Facility (2) 11/30/2018 Variable 5.50% 5.50% 2,078 2,316 Engineering SA Services Technicos - Consortium of Brazilian Credit Facilities (3) 12/07/2018 Fixed 4.76% 4.76% — — Unsecured Notes Payable and Long-Term Debt Hill International Spain SA-Bankia S.A. & Bankinter S.A.(4) 12/31/2021 Fixed 2.17% 2.17% 1,745 2,202 Hill International Spain SA - IberCaja Banco. S.A. (4) 12/31/2019 Variable 3.42% 3.37% 250 407 Philadelphia Industrial Development Corporation Loan 03/31/2027 Fixed 2.75% 2.75% 556 599 Total notes payable and long-term debt, gross $ 48,654 $ 38,674 Less: unamortized discount and deferred financing costs related to Société Générale 2017 Term Loan Facility (825 ) (892 ) Notes payable and long-term debt $ 47,829 $ 37,782 Current portion of notes payable 3,159 3,406 Current portion of unamortized debt discount and deferred financing costs (173 ) (165 ) Current maturities of notes payable and long-term debt 2,986 3,241 Notes payable and long-term debt, net of current maturities 44,843 34,541 (1) Interest rates for variable interest rate debt are reflected on a weighted average basis through September 30, 2018 since inception. (2) Credit facility lender was formerly known as National Bank of Abu Dhabi. There is no stated maturity date as the loan is subject to periodic review by the bank. 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 September 30, 2018 and December 31, 2017 . (3) The unsecured Engineering SA Services revolving credit facilities are held with two banks in Brazil and are subject to automatic renewal on a monthly basis with varying terms. The borrowing availability is based on conversion rates from Brazilian Real. (4) Balances outstanding are reflected in U.S. dollars based on the conversion rates from Euros as of September 30, 2018 and December 31, 2017 .

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Schedule of additional cash flow information	The following table provides additional cash flow information: Nine Months Ended September 30, 2018 2017 Interest and related financing fees paid $ 3,652 $ 5,831 Income taxes paid $ 11,435 $ 7,713 Increase (decrease) in other current liabilities and decrease (increase) in additional paid-in capital related to ESA Put Options $ — $ (777 ) Increase in additional paid-in capital from the issuance of shares of common stock from cashless exercise of stock options $ 202 $ —

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Stockholders' Equity Note [Abstract]
Summary of changes in stockholders' equity	The following table summarizes the changes in stockholders’ equity during the nine months ended September 30, 2018 : Total Hill International, Inc. Stockholders Noncontrolling Interest Stockholders’ equity, December 31, 2017 $ 110,670 $ 109,075 $ 1,595 Net (loss) earnings (24,080 ) (24,176 ) 96 Other comprehensive earnings (loss) 1,280 1,733 (453 ) Comprehensive loss (22,800 ) (22,443 ) (357 ) Additional paid in capital 399 399 — Exercise of stock options 11,691 11,691 — Reversal of accrual for portion of ESA Put 745 745 — Acquisition of additional interest in ESA (745 ) (122 ) (623 ) Stockholders’ equity, September 30, 2018 $ 99,960 $ 99,345 $ 615

Segment and Related Informati_2

Segment and Related Information (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Schedule of Revenue by Geographic Region	Revenue by Geographic Region: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 United States $ 49,119 48.2 % $ 59,640 48.4 % $ 152,283 46.4 % 169,229 46.4 % Latin America 2,751 2.7 % 2,889 2.3 % 8,591 2.6 % 9,189 2.5 % Europe 10,493 10.3 % 10,811 8.8 % 31,260 9.5 % 30,931 8.5 % Middle East 30,689 30.1 % 42,248 34.3 % 106,443 32.5 % 131,211 36.0 % Africa 6,712 6.6 % 6,034 4.9 % 20,279 6.2 % 17,651 4.8 % Asia/Pacific 2,171 2.1 % 1,570 1.3 % 9,124 2.8 % 6,537 1.8 % Total $ 101,935 100.0 % $ 123,192 100.0 % $ 327,980 100.0 % $ 364,748 100.0 %
Schedule of Operating Profit (Loss)	Operating Profit (Loss): Three Months Ended Nine Months Ended 2018 2017 2018 2017 United States $ 6,422 $ 6,350 $ 20,202 $ 17,730 Latin America (413 ) 88 (2,127 ) (2,431 ) Europe * (1,084 ) (57 ) (1,644 ) 3,763 Middle East * 2,846 4,042 3,017 15,402 Africa 806 180 5,873 (533 ) Asia/Pacific * 297 (658 ) (191 ) (1,106 ) Corporate (16,543 ) (11,573 ) (41,564 ) (31,702 ) Total $ (7,669 ) $ (1,628 ) $ (16,434 ) $ 1,123 * includes Hill's share of loss (profit) of equity method affiliates on the Consolidated Statements of Operations.
Schedule of Depreciation and Amortization Expense	Depreciation and Amortization Expense: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Project Management $ 762 $ 1,422 $ 2,793 $ 4,397 Corporate 164 334 640 614 Total $ 926 $ 1,756 $ 3,433 $ 5,011
Schedule of Revenue By Client Type	Revenue By Client Type: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 U.S. federal government $ 4,329 4.2 % $ 3,729 3.0 % $ 12,124 3.7 % $ 10,965 3.0 % U.S. state, regional and local governments 34,047 33.4 % 43,177 35.0 % 103,759 31.6 % 119,132 32.7 % Foreign governments 27,039 26.5 % 33,524 27.2 % 94,476 28.8 % 105,546 28.9 % Private sector 36,520 35.9 % 42,762 34.8 % 117,621 35.9 % 129,105 35.4 % Total $ 101,935 100.0 % $ 123,192 100.0 % $ 327,980 100.0 % $ 364,748 100.0 %
Schedule of Property, Plant and Equipment, Net by Geographic Location	Property, Plant and Equipment, Net, by Geographic Location: September 30, 2018 December 31, 2017 United States $ 9,132 $ 9,434 Latin America 713 546 Europe 535 675 Middle East 967 1,164 Africa 95 105 Asia/Pacific 60 80 Total $ 11,502 $ 12,004

Liquidity (Details)

Liquidity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Liquidity [Line Items]
Cash and cash equivalents	$ 23,083	$ 21,353
U.S. Revolver | Letters of credit
Liquidity [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	104
Foreign credit agreements | International Revolver | Revolving credit facility
Liquidity [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	1,640
Foreign credit agreements | Other Foreign Banks | International Revolver | Revolving credit facility
Liquidity [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 4,573

Basis of Presentation - Reclass

Basis of Presentation - Reclassification (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Current portion of retainage receivable	$ 18,775	$ 9,249

Basis of Presentation - Concent

Basis of Presentation - Concentration of Credit Risk (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Concentration Risk [Line Items]
Concentration risk	100.00%		100.00%
Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk	100.00%	100.00%	100.00%	100.00%
1 Customer | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk			17.00%
2 Customers | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk					34.00%

Basis of Presentation - Antidil

Basis of Presentation - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total number of shares excluded from diluted earnings per common share (in shares)	1,966	2,079	1,966	2,079
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)	96	96	96	96

Basis of Presentation - Earning

Basis of Presentation - Earnings per Share (Details) - USD ($) shares in Thousands, $ in Thousands	May 10, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Loss from continuing operations		$ (8,484)	$ (1,595)	$ (23,217)	$ (575)
Less: net earnings - noncontrolling interest		60	55	96	175
Net loss from continuing operations attributable to Hill		$ (8,544)	$ (1,650)	$ (23,313)	$ (750)
Employee Stock Option | ICEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of options granted	$ 80					$ 80
Options outstanding (in shares)		263	81	263	81

Basis of Presentation - Recentl

Basis of Presentation - Recently Issues Accounting Pronouncements (Details)	Oct. 31, 2018lease
Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of domestic real estate leases	40

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)segment
Revenue from Contract with Customer [Abstract]
Number of operating segments | segment		1
Revenue recognized	$ 5,103	$ 12,561
Remaining performance obligations	$ 95,955	$ 95,955
Remaining performance obligations, percentage	53.00%	53.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations, expected term	12 months	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations, expected term	4 years	4 years

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 101,935	$ 327,980
Percent of revenue	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 49,119	$ 152,283
Percent of revenue	48.20%	46.40%
Latin America
Disaggregation of Revenue [Line Items]
Revenue	$ 2,751	$ 8,591
Percent of revenue	2.70%	2.60%
Europe
Disaggregation of Revenue [Line Items]
Revenue	$ 10,493	$ 31,260
Percent of revenue	10.30%	9.50%
Middle East
Disaggregation of Revenue [Line Items]
Revenue	$ 30,689	$ 106,443
Percent of revenue	30.10%	32.50%
Africa
Disaggregation of Revenue [Line Items]
Revenue	$ 6,712	$ 20,279
Percent of revenue	6.60%	6.20%
Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenue	$ 2,171	$ 9,124
Percent of revenue	2.10%	2.80%
Fixed Price
Disaggregation of Revenue [Line Items]
Revenue	$ 23,583	$ 82,434
Fixed Price | United States
Disaggregation of Revenue [Line Items]
Revenue	2,575	8,436
Fixed Price | Latin America
Disaggregation of Revenue [Line Items]
Revenue	2,751	7,314
Fixed Price | Europe
Disaggregation of Revenue [Line Items]
Revenue	4,950	15,271
Fixed Price | Middle East
Disaggregation of Revenue [Line Items]
Revenue	11,904	45,377
Fixed Price | Africa
Disaggregation of Revenue [Line Items]
Revenue	621	1,264
Fixed Price | Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenue	782	4,772
T&M
Disaggregation of Revenue [Line Items]
Revenue	78,352	245,546
T&M | United States
Disaggregation of Revenue [Line Items]
Revenue	46,544	143,847
T&M | Latin America
Disaggregation of Revenue [Line Items]
Revenue	0	1,277
T&M | Europe
Disaggregation of Revenue [Line Items]
Revenue	5,543	15,989
T&M | Middle East
Disaggregation of Revenue [Line Items]
Revenue	18,785	61,066
T&M | Africa
Disaggregation of Revenue [Line Items]
Revenue	6,091	19,015
T&M | Asia/Pacific
Disaggregation of Revenue [Line Items]
Revenue	$ 1,389	$ 4,352

Accounts Receivable - Component

Accounts Receivable - Components of Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Components of accounts receivable
Billed	$ 165,966	$ 186,411
Unbilled	40,150	34,050
Accounts receivable, gross	206,116	220,461
Allowance for doubtful accounts	(68,189)	(72,850)
Accounts receivable, less allowance for doubtful accounts	137,927	$ 147,611
Reduction to allowance for doubtful accounts receivable	$ 4,100

Intangible Assets - Acquired (D

Intangible Assets - Acquired (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summary of acquired intangible assets
Gross Carrying Amount	$ 8,147	$ 18,281
Accumulated Amortization	5,714	14,373
Intangible assets, net	2,433	3,908
Client relationship
Summary of acquired intangible assets
Gross Carrying Amount	7,604	16,397
Accumulated Amortization	5,442	12,862
Contract
Summary of acquired intangible assets
Gross Carrying Amount	0	1,007
Accumulated Amortization	0	1,007
Trade name
Summary of acquired intangible assets
Gross Carrying Amount	543	877
Accumulated Amortization	$ 272	$ 504

Intangible Assets - Amortizatio

Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense related to intangible assets	$ 209	$ 493	$ 784	$ 1,556
Estimated amortization expense of intangible assets for the next five years
2018 (remaining 3 months)	228		228
2,018	912		912
2,019	651		651
2,020	297		297
2,021	$ 232		$ 232

Goodwill (Details)

Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)unit
Summary of changes in carrying value of goodwill during 2017
Balance, December 31, 2017	$ 52,658
Translation adjustments	(4,254)
Balance, September 30, 2018	$ 48,404
Number of reporting units | unit	1

Accounts Payable and Accrued _3

Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Components of accounts payable and accrued expenses
Accounts payable	$ 31,520	$ 32,345
Accrued payroll and related expenses	29,557	29,569
Accrued subcontractor fees	13,848	10,814
Accrued agency fees	578	1,671
Accrued legal and professional fees	1,600	2,983
Other accrued expenses	6,243	5,839
Accounts payable and accrued expenses, net	$ 83,346	$ 83,221

Notes Payable and Long-Term D_3

Notes Payable and Long-Term Debt - Summary of Outstanding Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total notes payable and long-term debt, gross	$ 48,654	$ 38,674
Less: unamortized discount and deferred financing costs related to Société Générale 2017 Term Loan Facility	(825)	(892)
Notes payable and long-term debt	47,829	37,782
Current portion of notes payable	3,159	3,406
Current portion of unamortized debt discount and deferred financing costs	(173)	(165)
Current maturities of notes payable and long-term debt	2,986	3,241
Notes payable and long-term debt, net of current maturities	$ 44,843	$ 34,541
Hill International, Inc. - Société Générale 2017 Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Variable interest rate	7.48%	7.32%
Total notes payable and long-term debt, gross	$ 29,625	$ 29,850
Hill International, Inc. - Société Générale Domestic Revolving Credit Facility | Secured Debt
Debt Instrument [Line Items]
Variable interest rate	6.13%	5.25%
Total notes payable and long-term debt, gross	$ 14,400	$ 3,300
Hill International N.V.. - Société Générale International Revolving Credit Facility | Secured Debt
Debt Instrument [Line Items]
Variable interest rate		4.10%
Total notes payable and long-term debt, gross	$ 0	$ 0
Hill International, Inc. - First Abu Dhabi Bank PJSC Overdraft Credit Facility | Unsecured Debt
Debt Instrument [Line Items]
Variable interest rate	5.50%	5.50%
Total notes payable and long-term debt, gross	$ 2,078	$ 2,316
Engineering SA Services Technicos - Consortium of Brazilian Credit Facilities | Unsecured Debt
Debt Instrument [Line Items]
Fixed interest rate	4.76%	4.76%
Total notes payable and long-term debt, gross	$ 0	$ 0
Hill International Spain SA - Bankia, S.A. and Bankinter, S.A | Unsecured Debt
Debt Instrument [Line Items]
Fixed interest rate	2.17%	2.17%
Total notes payable and long-term debt, gross	$ 1,745	$ 2,202
Hill International Spain SA - IberCaja Banco, S.A. | Unsecured Debt
Debt Instrument [Line Items]
Variable interest rate	3.42%	3.37%
Total notes payable and long-term debt, gross	$ 250	$ 407
Philadelphia Industrial Development Corporation Loan | Unsecured Debt
Debt Instrument [Line Items]
Fixed interest rate	2.75%	2.75%
Total notes payable and long-term debt, gross	$ 556	$ 599

Notes Payable and Long-Term D_4

Notes Payable and Long-Term Debt - Term Loan Facilities and Revolving Credit Facilities (Details)	Jun. 21, 2017	May 05, 2017EUR (€)	Sep. 30, 2018EUR (€)	Sep. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	May 05, 2017USD ($)
Debt Instrument [Line Items]
Long-term debt				$ 47,829,000	$ 37,782,000
Term loan payable
Debt Instrument [Line Items]
Aggregate principal amount							$ 30,000,000
Term of debt	6 years
Quarterly principal payment, percentage	1.00%
Revolving credit facility | Other Assets
Debt Instrument [Line Items]
Unamortized balances of expenses and fees				2,019,000	$ 2,400,000
Secured Credit Facilities
Debt Instrument [Line Items]
Debt covenant leverage ratio limit		3
Increase in applicable interest rate upon default (as a percent)		2.00%
Revolving credit facility | Secured Credit Facilities
Debt Instrument [Line Items]
Consolidated net leverage ratio		3
U.S. Revolver | British Bankers Association LIBOR Rate
Debt Instrument [Line Items]
Basis of effective interest rate (as a percent)		3.75%
U.S. Revolver | Base Rate
Debt Instrument [Line Items]
Basis of effective interest rate (as a percent)		2.75%
U.S. Revolver | Letters of credit
Debt Instrument [Line Items]
Maximum borrowing capacity							20,000,000
Amounts outstanding				9,828,000
Available borrowing capacity				104,000
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 | Secured Credit Facilities | Letters of credit
Debt Instrument [Line Items]
Maximum borrowing capacity							20,000,000
International Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity				10,630,000
International Revolver | EURIBOR
Debt Instrument [Line Items]
Basis of effective interest rate (as a percent)			4.50%
International Revolver | Letters of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				9,288,000		$ 9,130,000	8,000,000
International Revolver | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity		€ 9,156,000	€ 6,193,000	7,190,000			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				1,640,000
International Revolver | Secured Credit Facilities | Letters of credit
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 8,000,000
Other Foreign Banks | International Revolver | Revolving credit facility | Foreign credit agreements
Debt Instrument [Line Items]
Amounts outstanding				2,617,000
Available borrowing capacity				$ 4,573,000

Notes Payable and Long-Term D_5

Notes Payable and Long-Term Debt - Other Financing Arrangements (Details) - USD ($)	Jul. 25, 2018	May 01, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt			$ 47,829,000	$ 37,782,000
Notes Payable, Other Payables | Premium Financing Agreement with AFCO Premium Credit LLC
Debt Instrument [Line Items]
Aggregate principal amount	$ 86,000	$ 2,471,000
Down payment		$ 260,000
Term of debt	7 months	10 months
Stated interest rate	4.57%	4.57%
Long-term debt		$ 1,178,000

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Summary of additional cash flow information
Interest and related financing fees paid	$ 3,652	$ 5,831
Income taxes paid	11,435	7,713
Increase (decrease) in other current liabilities and decrease (increase) in additional paid-in capital related to ESA Put Options	0	(777)
Increase in additional paid-in capital from the issuance of shares of common stock from cashless exercise of stock options	$ 202	$ 0

Share-Based Compensation (Detai

Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	Aug. 17, 2018	May 10, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ (47)	$ 1,048	$ 737	$ 2,261
Reduction to allowance for doubtful accounts receivable			$ 4,100
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual base salary	$ 650
Target cash bonus	675
Annual share-based compensation	$ 900
Chief Executive Officer | Performance vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights	50.00%
Chief Executive Officer | Time vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights	50.00%
Exercise price 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)			1,966,000		1,966,000
Weighted average exercise price of outstanding options (in dollars per share)			$ 4.35		$ 4.35
Exercise price 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options lapsed (in shares)					928,000
Weighted average exercise price of options lapsed (in dollars per share)					$ 5.77
Exercise price 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options forfeited (in shares)					285,000
Weighted average exercise price of options forfeited (in dollars per share)					$ 4.66
2008 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased (in shares)			0	5,000	6,000	36,000
Aggregate purchase price				$ 24	$ 29	$ 138
Employee Stock Option | ICEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)			263,000	81,000	263,000	81,000
Aggregate fair value of options granted		$ 80					$ 80
Options granted (in shares)			53,000		138,000
Compensation expense			$ (162)		$ 399

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Increase (decrease) in stockholders' equity
Stockholders’ equity, December 31, 2017			$ 110,670
Net earnings (loss)	$ (8,484)	$ (4,239)	(24,080)	$ 37,424
Other comprehensive earnings (loss)			1,280
Comprehensive loss			(22,800)
Additional paid in capital			399
Exercise of stock options			11,691
Reversal of accrual for portion of ESA Put			745
Acquisition of additional interest in ESA			(745)
Stockholders’ equity, September 30, 2018	99,960		99,960
Non-controlling Interests
Increase (decrease) in stockholders' equity
Stockholders’ equity, December 31, 2017			1,595
Net earnings (loss)			96
Other comprehensive earnings (loss)			(453)
Comprehensive loss			(357)
Additional paid in capital			0
Exercise of stock options			0
Reversal of accrual for portion of ESA Put			0
Acquisition of additional interest in ESA			(623)
Stockholders’ equity, September 30, 2018	615		615
Hill International, Inc. Stockholders
Increase (decrease) in stockholders' equity
Stockholders’ equity, December 31, 2017			109,075
Net earnings (loss)			(24,176)
Other comprehensive earnings (loss)			1,733
Comprehensive loss			(22,443)
Additional paid in capital			399
Exercise of stock options			11,691
Reversal of accrual for portion of ESA Put			745
Acquisition of additional interest in ESA			(122)
Stockholders’ equity, September 30, 2018	$ 99,345		$ 99,345

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective income tax rate (as a percent)	5.10%	(40.10%)	(14.40%)	39.00%
Income tax expense related to interest and penalties	$ 0	$ 0	$ 0	$ 0
Other liabilities
Income Tax Contingency [Line Items]
Reserve for uncertain tax positions	$ 2,587,000		$ 2,587,000		$ 2,676,000

Segment and Related Informati_3

Segment and Related Information - Revenue by Geographic Region (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)segment	Sep. 30, 2017USD ($)
Consulting Fee Revenue and Total Revenue by Geographic Region:
Number of reporting units | segment			1
Revenues	$ 101,935	$ 123,192	$ 327,980	$ 364,748
Percent of revenue	100.00%		100.00%
United States
Consulting Fee Revenue and Total Revenue by Geographic Region:
Revenues	$ 49,119	59,640	$ 152,283	169,229
Percent of revenue	48.20%		46.40%
Latin America
Consulting Fee Revenue and Total Revenue by Geographic Region:
Revenues	$ 2,751	2,889	$ 8,591	9,189
Percent of revenue	2.70%		2.60%
Europe
Consulting Fee Revenue and Total Revenue by Geographic Region:
Revenues	$ 10,493	10,811	$ 31,260	30,931
Percent of revenue	10.30%		9.50%
Middle East
Consulting Fee Revenue and Total Revenue by Geographic Region:
Revenues	$ 30,689	42,248	$ 106,443	131,211
Percent of revenue	30.10%		32.50%
Africa
Consulting Fee Revenue and Total Revenue by Geographic Region:
Revenues	$ 6,712	6,034	$ 20,279	17,651
Percent of revenue	6.60%		6.20%
Asia/Pacific
Consulting Fee Revenue and Total Revenue by Geographic Region:
Revenues	$ 2,171	$ 1,570	$ 9,124	$ 6,537
Percent of revenue	2.10%		2.80%
Geographic Concentration Risk
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk | United States
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of revenue	48.20%	48.40%	46.40%	46.40%
Geographic Concentration Risk | Latin America
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of revenue	2.70%	2.30%	2.60%	2.50%
Geographic Concentration Risk | Europe
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of revenue	10.30%	8.80%	9.50%	8.50%
Geographic Concentration Risk | Middle East
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of revenue	30.10%	34.30%	32.50%	36.00%
Geographic Concentration Risk | Africa
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of revenue	6.60%	4.90%	6.20%	4.80%
Geographic Concentration Risk | Asia/Pacific
Consulting Fee Revenue and Total Revenue by Geographic Region:
Percent of revenue	2.10%	1.30%	2.80%	1.80%

Segment and Related Informati_4

Segment and Related Information - Operating Profit (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Profit (Loss)
Operating profit (loss)	$ (7,669)	$ (1,628)	$ (16,434)	$ 1,123
Operating segment | United States
Operating Profit (Loss)
Operating profit (loss)	6,422	6,350	20,202	17,730
Operating segment | Latin America
Operating Profit (Loss)
Operating profit (loss)	(413)	88	(2,127)	(2,431)
Operating segment | Europe
Operating Profit (Loss)
Operating profit (loss)	(1,084)	(57)	(1,644)	3,763
Operating segment | Middle East
Operating Profit (Loss)
Operating profit (loss)	2,846	4,042	3,017	15,402
Operating segment | Africa
Operating Profit (Loss)
Operating profit (loss)	806	180	5,873	(533)
Operating segment | Asia/Pacific
Operating Profit (Loss)
Operating profit (loss)	297	(658)	(191)	(1,106)
Corporate
Operating Profit (Loss)
Operating profit (loss)	$ (16,543)	$ (11,573)	$ (41,564)	$ (31,702)

Segment and Related Informati_5

Segment and Related Information - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Depreciation and Amortization Expense
Depreciation and amortization expense	$ 926	$ 1,756	$ 3,433	$ 5,011
Operating segment | Project Management
Depreciation and Amortization Expense
Depreciation and amortization expense	762	1,422	2,793	4,397
Corporate
Depreciation and Amortization Expense
Depreciation and amortization expense	$ 164	$ 334	$ 640	$ 614

Segment and Related Informati_6

Segment and Related Information - Revenue by Client Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consulting Fee Revenue and Total Revenue By Client Type:
Revenues	$ 101,935	$ 123,192	$ 327,980	$ 364,748
Percent of revenue	100.00%		100.00%
U.S. federal government
Consulting Fee Revenue and Total Revenue By Client Type:
Revenues	$ 4,329	3,729	$ 12,124	10,965
U.S. state, regional and local governments
Consulting Fee Revenue and Total Revenue By Client Type:
Revenues	34,047	43,177	103,759	119,132
Foreign governments
Consulting Fee Revenue and Total Revenue By Client Type:
Revenues	27,039	33,524	94,476	105,546
Private sector
Consulting Fee Revenue and Total Revenue By Client Type:
Revenues	$ 36,520	$ 42,762	$ 117,621	$ 129,105
Customer Concentration Risk
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk | U.S. federal government
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of revenue	4.20%	3.00%	3.70%	3.00%
Customer Concentration Risk | U.S. state, regional and local governments
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of revenue	33.40%	35.00%	31.60%	32.70%
Customer Concentration Risk | Foreign governments
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of revenue	26.50%	27.20%	28.80%	28.90%
Customer Concentration Risk | Private sector
Consulting Fee Revenue and Total Revenue By Client Type:
Percent of revenue	35.90%	34.80%	35.90%	35.40%

Segment and Related Informati_7

Segment and Related Information - Property, Plant and Equipment, Net by Geographic Location (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	$ 11,502	$ 12,004
United States
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	9,132	9,434
Latin America
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	713	546
Europe
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	535	675
Middle East
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	967	1,164
Africa
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	95	105
Asia/Pacific
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	$ 60	$ 80

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Feb. 08, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Loss Contingencies [Line Items]
Less: Loss on performance bond		$ 0	$ 0	$ 7,938	$ 0
Other liabilities
Loss Contingencies [Line Items]
Potential tax liability related to certain foreign subsidiaries		$ 882		$ 882
Performance Guarantee
Loss Contingencies [Line Items]
Less: Loss on performance bond	$ 7,938