Engility 10-Q 6 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 02, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	Engility Holdings, Inc.
Entity Central Index Key	1,544,229
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		36,734,601

Unaudited Consolidated Balance

Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 75,898	$ 7,123
Receivables, net	389,410	286,403
Prepaid and deferred income taxes, current, net	21,570	296
Other current assets	31,664	27,488
Total current assets	518,542	321,310
Property, plant and equipment, net	40,523	19,839
Goodwill	1,382,140	644,554
Identifiable intangible assets, net	451,497	123,549
Deferred tax assets	171,337	4,793
Other assets	24,574	8,591
Total assets	2,588,613	1,122,636
Current liabilities:
Current portion of long-term debt	8,447	13,750
Accounts payable, trade	62,691	49,121
Accrued employment costs	105,810	47,824
Accrued expenses	103,207	71,582
Advance payments and billings in excess of costs incurred	43,962	22,300
Deferred income taxes, current and income tax liabilities	458	9,810
Other current liabilities	39,774	21,098
Total current liabilities	364,349	235,485
Long-term debt	1,140,571	279,500
Income tax liabilities	69,250	79,713
Other liabilities	71,878	51,185
Total liabilities	$ 1,646,048	$ 645,883
Commitments and contingencies (see Note 11)
Equity:
Preferred stock, par value $0.01 per share, 25,000 shares authorized, none issued or outstanding as of September 30, 2015 and December 31, 2014	$ 0	$ 0
Common stock, par value $0.01 per share, 175,000 shares authorized, 36,735 and 17,592 shares issued and outstanding as of September 30, 2015 and December 31, 2014, respectively	368	176
Additional paid-in capital	1,231,173	770,764
Accumulated deficit	(292,164)	(295,543)
Accumulated other comprehensive income	(8,457)	(9,018)
Non-controlling interest	11,645	10,374
Total equity	942,565	476,753
Total liabilities and equity	$ 2,588,613	$ 1,122,636

Unaudited Consolidated Balance3

Unaudited Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	25,000,000	25,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	175,000,000	175,000,000
Common stock, shares issued (shares)	36,735,000	17,592,000
Common stock, shares outstanding (shares)	36,735,000	17,592,000

Unaudited Consolidated Statemen

Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 570,459	$ 345,061	$ 1,548,601	$ 1,047,575
Costs and expenses
Cost of revenue	486,382	293,039	1,316,482	897,114
Selling, general and administrative expenses	49,578	25,255	159,493	80,897
Total costs and expenses	535,960	318,294	1,475,975	978,011
Operating income	34,499	26,767	72,626	69,564
Interest expense, net	31,261	3,342	80,589	9,538
Other income (expenses), net	15	(67)	44	(20)
Income (loss) before income taxes	3,253	23,358	(7,919)	60,006
Provision (benefit) for income taxes	(1,661)	9,115	(15,662)	23,454
Net income	4,914	14,243	7,743	36,552
Less: Net income attributable to non-controlling interest	1,264	1,082	4,364	3,615
Net income attributable to Engility	$ 3,650	$ 13,161	$ 3,379	$ 32,937
Earnings per share attributable to Engility
Basic (USD per share)	$ 0.10	$ 0.77	$ 0.10	$ 1.93
Diluted (USD per share)	$ 0.10	$ 0.73	$ 0.10	$ 1.83
Weighted average number of shares outstanding
Basic (shares)	36,623	17,151	32,527	17,080
Diluted (shares)	37,136	18,065	33,065	17,994

Unaudited Consolidated Stateme5

Unaudited Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 4,914	$ 14,243	$ 7,743	$ 36,552
Pension liability adjustment, net of tax benefit of $327 for the nine months ended September 30, 2015	0	0	(511)	0
Unrealized gain on derivative instruments, net of tax expense, of $301 and $684 for the three and nine months ended September 30, 2015, respectively	472	0	1,072	0
Other comprehensive income, net of tax	472	0	561	0
Comprehensive income	5,386	14,243	8,304	36,552
Less: Net income attributable to non-controlling interest	1,264	1,082	4,364	3,615
Comprehensive income attributable to Engility	$ 4,122	$ 13,161	$ 3,940	$ 32,937

Unaudited Consolidated Stateme6

Unaudited Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Pension liability adjustment, tax		$ 327
Unrealized losses on derivative instruments, tax	$ 301	$ 684

Unaudited Consolidated Stateme7

Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income	$ 7,743	$ 36,552
Share-based compensation	9,351	7,283
Depreciation and amortization	42,918	15,840
Amortization of bank debt fees	10,858	1,218
Deferred income taxes	12,198	(1,631)
Changes in operating assets and liabilities, excluding acquired amounts:
Receivables	46,034	40,555
Other assets	19,890	5,807
Accounts payable, trade	(22,113)	(12,049)
Accrued employment costs	(34,369)	5,349
Accrued expenses	(1,762)	(6,673)
Advance payments and billings in excess of costs incurred	3,658	2,339
Other liabilities	(33,870)	(14,105)
Net cash provided by operating activities	60,536	80,485
Investing activities:
Acquisitions, net of cash acquired	25,478	(207,250)
Capital expenditures	(12,600)	(2,765)
Net cash provided by (used in) investing activities	12,878	(210,015)
Financing activities:
Gross borrowings from issuance of long-term debt	585,000	75,000
Repayment of long-term debt	(376,553)	(10,313)
Gross borrowings from revolving credit facility	157,000	383,000
Repayments of revolving credit facility	(115,000)	(323,000)
Debt issuance costs	(42,425)	(1,131)
Equity issuance costs	(2,590)	0
Proceeds from share-based payment arrangements	279	1,481
Payment of employee withholding taxes on share-based compensation	(8,017)	(2,430)
Excess tax deduction on share-based compensation	5,061	1,642
Dividends paid	(204,300)	0
Distributions to non-controlling interest member	(3,094)	(4,990)
Net cash (used in) provided by financing activities	(4,639)	119,259
Net change in cash and cash equivalents	68,775	(10,271)
Cash and cash equivalents, beginning of period	7,123	29,003
Cash and cash equivalents, end of period	$ 75,898	$ 18,732

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Description of Business: Engility Holdings, Inc. (Engility) has provided mission critical services to the U.S. government for over six decades. Engility serves among other federal agencies, the U.S. Department of Defense (DoD), U.S. Department of Justice (DoJ), U.S. Agency for International Development (USAID), U.S. Department of State (DoS), Federal Aviation Administration (FAA) and Department of Homeland Security (DHS). With Engility's acquisition of TASC, Inc. (TASC) on February 26, 2015, Engility further diversified its portfolio to add leading positions with U.S. national security, public safety and space-related agencies. These agencies include the National Geospatial-Intelligence Agency (NGA), National Security Agency (NSA), Defense Intelligence Agency (DIA), National Reconnaissance Office (NRO), National Aeronautical and Space Administration (NASA), and U.S. Air Force. The acquisition of TASC also enhanced Engility's market position with DHS, Defense Threat Reduction Agency (DTRA), FAA, and Missile Defense Agency (MDA). As used herein, the terms “Engility,” the “Company,” “we,” “us” or “our” refers to (i) Engility and its subsidiaries, for all periods prior to the closing of the TASC acquisition, and (ii) New Engility and its subsidiaries, for all periods following the TASC acquisition. The TASC acquisition was effected through a new holding company named New East Holdings, Inc. (New Engility). As a result of the business combination, New Engility succeeded to and continues to operate, directly or indirectly, the existing business of Engility and, indirectly, acquired the existing business of TASC. Engility has no operations other than owning 100% of the capital stock of TASC Parent LLC, a Delaware limited liability company (“Holdings”) (directly or through other wholly-owned subsidiaries with no operations other than owning capital stock of Holdings), and the consolidated financial statements of Engility and its consolidated subsidiaries are identical in all respects to the consolidated financial statements of Holdings and its consolidated subsidiaries. Principles of Consolidation and Basis of Presentation: The Unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and in accordance with Article 10 of Regulation S-X of the U.S. Securities and Exchange Commission (SEC), and reflect the financial position, results of operations and cash flows of our businesses. Accordingly, they do not include all of the disclosures required by U.S. GAAP for a complete set of annual audited financial statements. All significant intercompany accounts and transactions are eliminated in consolidation. The Unaudited Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. On January 31, 2014 and February 26, 2015, we completed the acquisitions of Dynamics Research Corporation (DRC) and TASC, respectively, which are more fully described in Note 3 to the accompanying Unaudited Consolidated Financial Statements. These transactions were recorded using the purchase method of accounting; accordingly, DRC's and TASC's financial results are included in the Unaudited Consolidated Financial Statements for the periods subsequent to the acquisition. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in our Annual Report on Form 10-K/A filed with the SEC on November 4, 2015 for the year ended December 31, 2014 (2014 Form 10-K/A). In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included. Change in Accounting Principle for Revenue Recognition: As of January 1, 2015, we changed our methodology of recognizing revenue for all of our U.S. government contracts to apply the accounting guidance of Financial Accounting Standards Board (FASB), Accounting Standard Codification (ASC), Subtopic 605-35, as directed by ASC Topic 912, which permits revenue recognition on a percentage-of-completion basis. Previously, we applied this guidance only to contracts related to the construction or development of tangible assets. For contracts not related to those activities, we had applied the general revenue recognition guidance of Staff Accounting Bulletin (SAB), Topic 13, “Revenue Recognition.” We believe that the application of contract accounting under ASC 605-35 to all U.S. government contracts is preferable to the application of contract accounting under SAB Topic 13, based on the fact that the percentage of completion model utilized under ASC 605-35 is a recognized accounting model that better reflects the economics of a U.S. government contract during the contract performance period and better aligns Engility’s revenue policy with its peers. The financial impact resulting from the accounting change was immaterial to our financial statements. Revenue Recognition: Substantially all of the Company’s revenue is derived from services provided to the U.S. government and its agencies, primarily by the Company’s consulting staff and, to a lesser extent, subcontractors. The Company generates its revenue from the following types of contractual arrangements: cost-reimbursable-plus-fee contracts, time-and-materials contracts, and fixed-price contracts. Revenue on cost-reimbursable-plus-fee contracts is recognized as services are performed, generally based on allowable costs plus any recognizable earned fee. The Company considers fixed fees under cost-reimbursable-plus-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract. For cost-reimbursable-plus-fee contracts that include performance-based fee incentives, which are principally award fee arrangements, the Company recognizes income when such fees are probable and estimable. Estimates of the total fee to be earned are made based on contract provisions, prior experience with similar contracts or clients, and management’s evaluation of the performance on such contracts. Revenue for time-and-materials contracts is recognized as services are performed, generally on the basis of contract allowable labor hours worked multiplied by the contract-defined billing rates, plus allowable direct costs and indirect cost allocations associated with materials used and other direct expenses incurred in connection with the performance of the contract. Revenue on fixed-price contracts is recognized using percentage-of-completion based on actual costs incurred relative to total estimated costs for the contract. These estimated costs are updated during the term of the contract, and may result in revision by the Company of recognized revenue and estimated costs in the period in which they are identified. Profits on fixed-price contracts result from the difference between incurred costs and revenue earned. Contract accounting requires significant judgment relative to assessing risks, estimating contract revenue and costs, and making assumptions for schedule and technical issues. Due to the size and nature of many of the Company’s contracts, developing total revenue and cost at completion estimates requires the use of significant judgment. Contract costs include direct labor and billable expenses, an allocation of allowable indirect costs, and warranty obligations. Billable expenses are comprised of subcontracting costs and other direct costs that often include, but are not limited to, travel-related costs and telecommunications charges. The Company recognizes revenue and billable expenses from these transactions on a gross basis. Assumptions regarding the length of time to complete the contract also include expected increases in wages and prices for materials. Estimates of total contract revenue and costs are monitored during the term of the contract and are subject to revision as the contract progresses. Anticipated losses on contracts are recognized in the period they are deemed probable and can be reasonably estimated. The Company’s contracts may include the delivery of a combination of one or more of the Company’s service offerings. In these situations, the Company determines whether such arrangements with multiple service offerings should be treated as separate units of accounting based on how the elements are bid or negotiated, whether the customer can accept separate elements of the arrangement, and the relationship between the pricing on the elements individually and combined. Included in unbilled receivables, a component of receivables, net, are certain restructuring costs related to the performance of our U.S. Government contracts which are required to be recorded under GAAP but are not currently allocable to contracts. Such costs are expensed outside of our indirect rates and recognized as revenue for the portion we expect to be recoverable in our rates. At September 30, 2015 and December 31, 2014, these costs were approximately $8 million and $0 million , respectively. These costs are allocated to contracts when they are paid or otherwise agreed. We regularly assess the probability of recovery of these costs. This assessment requires us to make assumptions about the extent of cost recovery under our contracts and the amount of future contract activity. If the level of backlog in the future does not support the continued expensing of these costs, the profitability of our remaining contracts could be adversely affected. Revenue and profit in connection with contracts to provide services to the U.S. government that contain collection risk because the contracts are incrementally funded and subject to the availability of funds appropriated are deferred until a contract modification is obtained, indicating that adequate funds are available to the contract or task order. Non-controlling Interest: Engility holds a 50.1% majority interest in Forfeiture Support Associates, LLC (FSA). The results of operations of FSA are included in Engility’s Unaudited Consolidated Financial Statements. The non-controlling interest reported on the Unaudited Consolidated Balance Sheets represents the portion of FSA’s equity that is attributable to the non-controlling interest. Accounting Estimates: The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates using 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 revenue and expenses during the reporting periods. The most significant of these estimates relate to the recoverability, useful lives and valuation of identifiable intangible assets and goodwill, income tax contingencies and revenue and expenses for certain revenue arrangements. Actual amounts may differ from these estimates and could differ materially. For the nine months ended September 30, 2015, the recognized net adjustments related to changes in estimates at completion represented an increase to revenue and margin of $7 million . Earnings per Share: Basic earnings per share (EPS) is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted EPS reflects potential dilution that could occur if securities to issue common stock were exercised or converted into common stock. Diluted EPS includes the effect of the employee stock purchase plan, restricted stock units (RSU), stock options, performance shares and performance units calculated using the treasury stock method. No shares were excluded from diluted EPS for both the three and nine months ended September 30, 2015 and 2014. Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Net income attributable to Engility $ 3,650 $ 13,161 $ 3,379 $ 32,937 Weighted average number of shares outstanding – Basic 36,623 17,151 32,527 17,080 Dilutive effect of share-based compensation outstanding after application of the treasury stock method 513 914 538 914 Weighted average number of shares – Diluted 37,136 18,065 33,065 17,994 Earnings per share attributable to Engility Basic $ 0.10 $ 0.77 $ 0.10 $ 1.93 Diluted $ 0.10 $ 0.73 $ 0.10 $ 1.83

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU 2014-09 outlines a single comprehensive model for entities to use when accounting for revenue arising from contracts with customers and supersedes all current revenue recognition guidance, including industry-specific guidance. In July 2015, the FASB deferred the effective date of the updated by one year. This new guidance is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017; early adoption is not permitted. Entities have the option of using either a full retrospective or a modified approach to adopt the guidance. This update could impact the timing and amounts of revenue recognized. We are currently evaluating the effect that implementation of this update will have on our consolidated financial position and results of operations upon adoption. In June 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718) - Accounting for Share-based Payments when Terms of an award Provide That a Performance Target Could be Achieved after the Requisite Service Period. The Amendments in ASU 2014-12 require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. ASU 2014-12 is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. We do not expect this pronouncement to have a material impact on our financial statements. In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. The guidance requires an entity to evaluate whether there are conditions or events, in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued (or within one year after the financial statements are available to be issued when applicable) and to provide related footnote disclosures in certain circumstances. The guidance is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter. Early application is permitted. We do not believe the adoption of this guidance will have a significant impact on our consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-03, Interest—Imputation of Interest , which changes the presentation of debt issuance costs in financial statements. The amendments in this standard require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this standard. The guidance is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter. We do not believe the adoption of this guidance will have a significant impact on our consolidated financial statements. In August 2015, the FASB issued ASU No. 2015-15, Interest-Imputation of Interest: Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting , which addresses line-of-credit arrangements that were omitted from ASU 2015-03 (see above). This Update states that the SEC staff would not object to an entity deferring and presenting debt issuance costs related to a line-of-credit arrangement as an asset and subsequently amortizing those costs ratably over the term of the arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. We do not believe the adoption of this guidance will have a significant impact on our consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement Period Adjustments (Topic 805) . ASU 2015-16 requires an acquirer in a business combination to recognize provisional amounts when measurements were incomplete as of the end of a reporting period as an adjustment in the reporting period in which the provisional amount is determined. Prior to this standard, the acquirer was required to adjust such provisional amounts by restating prior period financial statements. ASU 2015-16 is effective for the annual period ending December 31, 2016 and for annual periods and interim periods thereafter with early adoption permitted. We do not believe the adoption of this guidance will have a significant impact on our consolidated financial statements.

Business Acquisitions

Business Acquisitions	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Business Acquisitions	Business Acquisitions TASC Acquisition On February 26, 2015, we completed the acquisition of TASC, a leading professional services provider to the national security and public safety markets, in an all-stock transaction. We acquired TASC to further diversify our portfolio to add leading positions with U.S. national security and public safety agency customers, including, the NGA, NSA, DIA, and other intelligence community agencies. We also added space-related agency customers such as the NRO, NASA, and U.S. Air Force. The acquisition of TASC also enhanced our market position with DHS, DTRA, FAA, and MDA. TASC had approximately 4,000 employees located throughout the United States as of February 26, 2015. The business combination was effected through a new holding company named New East Holdings, Inc. (New Engility). As a result of the business combination, New Engility succeeded to and continues to operate, directly or indirectly, the existing business of Engility and, indirectly, acquired the existing business of TASC. Accordingly, the combined companies now operate under New East Holdings, Inc. which was renamed “Engility Holdings, Inc.” upon the closing of the acquisition. The New Engility common stock, similar to the predecessor Engility common stock, trades on the New York Stock Exchange (NYSE) under the symbol “EGL.” As a result of the acquisition of TASC, former stockholders of TASC Parent Corporation, the parent company of TASC, held approximately 52% of our shares of common stock outstanding as of February 26, 2015, the closing date of the acquisition. As a condition to the merger, we entered into a Stockholders Agreement, dated February 26, 2015, with Birch Partners, LP (Birch), and for the limited purposes set forth therein, certain investment funds affiliated with Kohlberg Kravis Roberts & Co. L.P. (KKR) and certain investment funds affiliated with General Atlantic LLC (GA) (the Stockholders Agreement). The Stockholders Agreement establishes certain rights, restrictions and obligations of Birch, KKR and GA, and sets forth certain governance and other arrangements relating to Engility, including the right of Birch to designate (i) four directors for nomination to our board of directors for so long as each of KKR and GA (including their respective affiliates) beneficially own at least 50% of the shares of our common stock it owned as of the date of the Stockholders Agreement and (ii) two directors for nomination to our board of directors for so long as each of KKR and GA (including their respective affiliates) beneficially own at least 25% of the shares of our common stock it owned as of the date of the Stockholders Agreement. In connection with the acquisition, we issued 18,937,765 shares of Engility common stock on February 26, 2015 valued at approximately $663 million , and we assumed debt with an estimated fair value of $623 million . Engility declared a special cash dividend payable to stockholders of record as of immediately prior to the closing of the TASC transaction (the Cash Dividend), including holders of all outstanding RSUs and performance shares upon vesting, in the amount of $207 million , or $11.434 per share. For holders of unvested RSUs and performance shares, the Cash Dividend accrued on such grants and will be delivered to the holders upon the vesting of such grants. In connection with the acquisition, Engility has paid $203 million pursuant to the Cash Dividend to stockholders and holders of vested RSUs and options. The remaining Cash Dividend balance will be paid to holders upon the vesting of their outstanding RSUs and performance shares. We accounted for the acquisition of TASC as a business combination under ASC 805 with Engility as the accounting acquirer. We determined Engility was the accounting acquirer in accordance with ASC 805-10-25-5 as Engility gained control of TASC upon completion of the merger. To make this determination we considered factors as indicated in ASC 805-10-55, including which entity issued equity interests to effect the combination, board of director composition, stockholder ownership, voting control, restrictions on stockholder voting rights, anticipated management positions and the relative size of the two companies. Engility issued its equity to effect the combination, which is usually done by the acquirer. The board of directors immediately following the acquisition was comprised of eleven individuals, seven of whom are the Engility directors and the remaining four of whom are designated by Birch Partners, LP (Birch), the holder of approximately 99% of the outstanding common stock of TASC Parent Corporation prior to the acquisition. While the stockholders of TASC Parent Corporation own approximately 52% of the combined company common stock following the closing of the transaction, Birch executed, at the closing of the transaction, a stockholders agreement agreeing to vote (i) until it no longer has any director nomination rights, with respect to the election of directors, all of its shares in the same manner as, and in the same proportion to, all shares as voted by Engility stockholders (excluding the votes of Birch), other than with respect to its four director nominees; and (ii) with respect to all other proposals, all of its shares in excess of 30% of the total voting power of all issued and outstanding shares of the combined company (between 21% and 21.5% initially) in the same manner as, and in the same proportion to, all shares as voted by Engility stockholders (excluding the votes of Birch). Thus, with respect to proposals other than the election of directors, Birch only controls and is able to independently vote an aggregate of 30% of the outstanding shares of the combined company. Birch is not be able to transfer ownership for years one through three following the closing of the transaction and is limited in years four through six . The combined Engility company is led by Engility’s legacy President and Chief Executive Officer, Anthony Smeraglinolo, and John Hynes, TASC’s former President and Chief Executive Officer, became the Chief Operating Officer of the combined company, reporting to Mr. Smeraglinolo. Another consideration was the relative size of the two companies. Engility had greater revenue, total assets, earnings before interest, taxes, depreciation, and amortization (EBITDA), pre-tax income and employees. All of the above mentioned factors have led us to conclude that Engility was the accounting acquirer. We are in the process of finalizing the valuation of the TASC-related assets acquired and liabilities assumed, in particular those requiring significant judgment including evaluating purchased intangibles, lease values, liabilities, and reserves. The preliminary allocation of purchase price is as follows: Number of Engility shares issued 18,937,765 Share price on February 26, 2015 $ 46.45 Dividend payable to Engility stockholders 11.434 Value of Engility shares issued to TASC stockholders $ 35.016 Equity consideration $ 663,125 Cash $ 25,478 Receivables 149,041 Prepaid and deferred income taxes, current 26,015 Other current assets 26,286 Property, plant and equipment 15,835 Deferred tax assets 176,218 Other assets 5,096 Current portion of long-term debt (4,097 ) Accounts payable, trade (34,503 ) Accrued employment costs (92,396 ) Accrued expenses (33,387 ) Advance payments and billings in excess of costs incurred (18,004 ) Deferred income taxes, current and income taxes payable (248 ) Other current liabilities (32,522 ) Long-term debt (619,227 ) Other long-term liabilities (24,446 ) Identifiable intangible assets 360,400 Goodwill 737,586 $ 663,125 The goodwill arising from the TASC acquisition consists largely of the specialized nature of the workforce as well as the synergies and economies of scale expected from combining the operations of Engility and TASC and their respective subsidiaries. The goodwill arising from the TASC acquisition is not tax deductible. The valuation of the identified intangible assets acquired is summarized below: Useful Life (years) Customer contractual relationships 15 $ 335,700 Contractual backlog 1 17,700 Technology 15 7,000 Total intangible assets $ 360,400 From the date of acquisition, February 26, 2015, through September 30, 2015 , TASC generated $641 million of revenue and operating income of $38 million , of which $271 million of revenue and $15 million of operating income was generated in the three months ended September 30, 2015 . During the three and nine months ended September 30, 2015 , we incurred $16 million and $59 million , respectively, of acquisition and integration-related costs which are reflected in selling, general and administrative expenses. DRC Acquisition On January 31, 2014, we completed the acquisition of DRC pursuant to a definitive agreement dated December 20, 2013 . We paid $11.50 per share for DRC, for an aggregate purchase price of approximately $207 million in cash (including the retirement of approximately $86 million of indebtedness of DRC). As a result of the acquisition, DRC is now an indirect wholly-owned subsidiary of Engility. From the date of acquisition, January 31, 2014, through September 30, 2014 , DRC generated $164 million of revenue and an operating income of $5 million . Pro forma Results The following pro forma results of operations have been prepared as though the acquisition of TASC had occurred on January 1, 2014. These pro forma results include adjustments for (1) amortization expense for the estimated identifiable intangible assets in the preliminary allocation of purchase price, (2) the removal of historical TASC amortization expense, (3) adjustments to conform TASC policies to Engility's policies related to the timing and recognition of certain contract revenue and costs, (4) the alignment of TASC’s financial calendar to that of Engility’s and 5) the removal of acquisition-related expenses incurred and recorded in each of TASC and Engility’s results of operations in the three and nine months ended September 30, 2015 , and a related adjustment to record such costs in the three and nine months ended September 30, 2014 . The pro forma results of operations also include adjustments to reflect the acquisition of DRC as though the acquisition occurred on January 1, 2013. These pro forma results include adjustments for (1) amortization expense for the identifiable intangible assets in the final purchase price allocation, (2) the removal of historical DRC amortization expense, and (3) the removal of acquisition-related expenses incurred and recorded on each of DRC and Engility’s results of operations in the nine months ended September 30, 2014 . This pro forma information does not purport to be indicative of the results of operations that would have been attained had the acquisitions been made as of January 1, 2014 and January 1, 2013 respectively, or of results of operations that may occur in the future. Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Revenue $ 569,108 $ 618,946 $ 1,705,411 $ 1,895,698 Operating income 40,443 36,519 112,262 64,574

Receivables

Receivables	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Receivables	Receivables Our receivables principally relate to contracts with the U.S. government and prime contractors or subcontractors of the U.S. government. The components of contract receivables are presented in the table below. As of As of Billed receivables $ 118,657 $ 115,500 Unbilled receivables 273,119 172,385 Allowance for doubtful accounts (2,366 ) (1,482 ) Total receivables, net $ 389,410 $ 286,403

Goodwill and Identifiable Intan

Goodwill and Identifiable Intangible Assets	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identifiable Intangible Assets	Goodwill and Identifiable Intangible Assets Goodwill: In accordance with the accounting standards for business combinations, we record the assets acquired and liabilities assumed based on their estimated fair values at the date of the acquisition (commonly referred to as the purchase price allocation). Goodwill was $1,382 million and $645 million at September 30, 2015 and December 31, 2014, respectively. Goodwill increased by $738 million during the nine months ended September 30, 2015 as a result of the TASC acquisition. Identifiable Intangible Assets: Information on our identifiable intangible assets that are subject to amortization is presented in the table below. September 30, 2015 December 31, 2014 Weighted Average Amortization Period Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount (in years) Customer contractual relationships 17 $ 556,430 $ 119,036 $ 437,394 $ 220,730 $ 97,523 $ 123,207 Contractual backlog 1 21,800 14,425 7,375 4,100 3,758 342 Technology 15 7,000 272 6,728 — — — Total $ 585,230 $ 133,733 $ 451,497 $ 224,830 $ 101,281 $ 123,549 Our amortization expense recorded for our identifiable intangible assets is presented in the table below. Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Amortization expense $ 12,944 $ 3,851 $ 32,452 $ 11,006

Share-Based Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation Effect of TASC Acquisition on Engility Equity Awards The TASC acquisition constituted a change of control under the grant agreements for Engility's outstanding RSUs, stock options, and performance shares. The impact on these equity grants was as follows: RSUs: Pursuant to the terms of the RSU grant agreements, 364,983 RSUs held by our employees vested. Certain executive officers waived vesting with respect to 229,166 RSUs and our independent directors waived vesting with respect to 11,790 RSUs. The TASC acquisition also triggered the issuance of shares for 43,950 vested RSUs held by the independent directors, pursuant to the terms of the grant agreements for these RSUs. Stock Options: Pursuant to the terms of the stock option grant agreements entered into with holders of outstanding stock options, the exercise price adjusted to reflect the Cash Dividend, provided, that to the extent that adjusting the exercise price by the full amount of the Cash Dividend resulted in the exercise price of the stock options falling below 25% of the fair market value of the shares underlying such stock options, such excess portion of the Cash Dividend was paid to holders of the affected stock options in cash. Performance Shares: Pursuant to the terms of the performance share agreements entered into with holders of outstanding performance shares, we fixed the number of underlying shares that are eligible to be vested and issued with respect to our outstanding grants of performance shares. For the performance shares granted in 2013, the number of eligible underlying shares was fixed at 127% of their target value based on Engility's performance against the financial metrics set forth in the grant agreements, measured as of a shortened performance period prior to the closing date of the TASC acquisition in accordance with the terms of the award agreements. For the performance shares granted in 2014, as less than half of the performance period was complete at the time of the closing of the TASC acquisition, the number of underlying shares was fixed at their target value of 100% in accordance with the terms of the award agreements. The performance shares cliff vest according to their grant agreement dates, three years from grant date. New Awards Granted For the Nine Months Ended September 30, 2015 Performance Retention Awards: During the nine months ended September 30, 2015 , we granted 212,963 performance units at a target level of 100% (with the potential for the delivery of up to 425,926 shares of our common stock at the maximum performance level) to certain of our executives with a grant date fair value of $32.82 . The performance retention awards cliff vest after three years based on our performance at the end of a three -year period beginning January 1, 2015. The number of shares of our common stock that are ultimately vested and delivered in respect of these performance retention awards will range from 50% to 200% of the target grant amount depending on the Company’s performance against a metric of net debt to adjusted EBITDA, measured as of December 31, 2017. The performance retention awards may be settled in cash or stock at the sole discretion of the Compensation Committee. Performance Units: During the nine months ended September 30, 2015 , we granted 195,814 performance units at target level of 100% (with the potential for the delivery of up to 431,658 shares of our common stock at the maximum performance level) to certain of our employees with a grant date fair value of $32.29 . Performance units cliff vest after three years based on our performance at the end of a three-year period beginning January 1, 2015. The number of shares of our common stock that are ultimately vested and delivered in respect of these performance units will range from 0% to 200% of the target grant amount depending on the Engility's performance, as approved by the Compensation Committee of our Board of Directors (the "Compensation Committee"), based on two metrics: revenue and operating cash flow. At the end of the three-year period beginning on January 1, 2015, the vested performance units may be subject to further adjustment based on our total stockholder return (TSR) measured against the TSR of a peer group of companies previously approved by the Compensation Committee. If Engility is in the bottom quartile of TSR relative to its peer group, the ultimate number of shares of stock delivered with respect to the performance units will be reduced by 25% of their target number. If Engility is in the top quartile of TSR relative to its peer group, the ultimate number of shares of stock delivered with respect to the performance units will be increased by 25% of their target number. If Engility’s TSR falls within the middle two quartiles relative to its peer group, there will be no adjustment to the number of shares delivered. The performance units may be settled in cash or stock at the sole discretion of the Compensation Committee. Restricted Stock Units: During the nine months ended September 30, 2015 , we granted 127,899 RSUs to certain of our employees with a grant date fair value of $32.82 , which vest over a term of three years from the grant date, 25% on the first anniversary of the grant date, 25% on the second anniversary of the grant date and 50% on the third anniversary of the grant date. During the nine months ended September 30, 2015 , we granted 24,703 RSUs to the independent directors with a grant date fair value of $28.34 per share. These RSUs vest after one year from the grant date. The employee and director RSUs may be settled in cash or stock upon vesting at the sole discretion of the Compensation Committee. For the Nine Months Ended September 30, 2014 Performance Shares: During the nine months ended September 30, 2014 , we granted 102,961 performance shares at a target level of 100% ( 205,922 shares at the maximum performance level) to certain of our employees with a weighted average grant date fair value of $56.14 . Performance shares cliff vest after three years based on our performance at the end of a three-year period beginning January 1, 2014. The number of shares of our common stock that are ultimately vested and retained in respect of these performance shares will range from 0% to 200% of the target grant amount depending on the Company’s performance against a peer group, as approved by the Compensation Committee, based on the following two metrics, each of which are weighted equally: relative revenue (based on a compounded annual growth rate) and relative TSR. No shares will vest, including with respect to relative revenue, if we do not achieve at least a threshold level of performance for TSR. As discussed above, in conjunction with the TASC acquisition, the number of shares eligible to vest pursuant to the performance share awards became fixed. Restricted Stock Units: During the nine months ended September 30, 2014 , we granted 74,086 RSUs to certain of our employees with a weighted average grant date fair value of $44.33 . 68,633 of these RSUs would have vested over a term of three years from the grant date, 25% on the first anniversary of the grant date, 25% on the second anniversary of the grant date and 50% on the third anniversary of the grant date. 1,217 of these RSU's would have cliff vested on the third anniversary of the grant date. The remaining 4,236 of these RSUs, which were only provided to non-executive employees, would have cliff vested on the first anniversary of the grant date. Outstanding RSUs that did not vest in connection with the TASC acquisition (pursuant to waivers executed by certain of our executive officers) will automatically convert into shares of our common stock upon vesting, and remain subject to forfeiture until certain restrictions are met. All other RSUs granted during this period vested in connection with TASC acquisition in accordance with the term of the underlying award agreement. During the nine months ended September 30, 2014 , we granted 11,790 RSUs to the independent directors with a weighted average grant date fair value of $38.16 per share. These RSUs vested after one year from the grant date, but will not be converted to shares of Engility common stock until the earlier of (i) the date on which the person ceases to be a director of the company or (ii) a change of control of the Company. As discussed above, the vesting of all of these RSUs was accelerated and the underlying shares were delivered to the holders as a result of the TASC acquisition, with the exception of RSUs held by certain of our executive officers and independent directors, for which acceleration was waived.

Defined Benefit Pension Plan

Defined Benefit Pension Plan	9 Months Ended
	Sep. 30, 2015
Postemployment Benefits [Abstract]
Defined Benefit Pension Plan	Defined Benefit Pension Plan DRC Pension Upon the acquisition of DRC, we assumed DRC's Defined Benefit Pension Plan (the Pension Plan), which is non-contributory, covering substantially all employees of DRC who had completed a year of service prior to July 1, 2002. Membership in the Pension Plan was frozen effective July 1, 2002 and participants’ calculated pension benefit was frozen effective December 31, 2006. Our funding policy is to contribute at least the minimum amount required by the Employee Retirement Income Security Act of 1974. Additional amounts are contributed to assure that plan assets will be adequate to provide retirement benefits. We expect to make no contributions during the remainder of 2015 to fund the pension plan. The components of net periodic pension income for the DRC pension plan are as follows: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Interest cost on projected benefit obligation $ 1,000 $ 979 $ 2,998 $ 2,610 Expected return on plan assets (1,458 ) (1,457 ) (4,375 ) (3,883 ) Net loss amortization 57 — 173 — Net periodic pension expense (income) $ (401 ) $ (478 ) $ (1,204 ) $ (1,273 ) TASC Defined Benefit Plan Upon the closing of the TASC acquisition, we assumed TASC's defined benefit plan in which certain employees are eligible to participate based upon service with TASC's prior parent. This plan offers two retirement programs, a Retiree Health Reimbursement Account Plan (RHRA) and a Cash Bonus Plan, which provide a restoration of certain pension benefits that would have been forfeited as a result of years of service and final average pay being frozen by TASC's prior parent. The liability of the TASC defined benefit plan was $21 million as of September 30, 2015 and on the date of acquisition.

Debt

Debt	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Debt	Debt 2015 Credit Facility In connection with the acquisition of TASC, which included the payment of the Cash Dividend and the repayment of outstanding debt under our 2013 Credit Facility (as defined below), we borrowed $585 million under a promissory note issued by our wholly-owned subsidiary Engility LLC (f/k/a Engility Corporation) and guaranteed by Predecessor Engility (as defined below) and certain other Predecessor Engility (as defined below) subsidiaries (the Engility Bridge Loan). In addition, we guaranteed the debt of TASC comprised of the First Lien Credit Agreement and the Second Lien Credit Agreement, consisting of (a)(i) a $395 million senior secured first lien term loan facility (the Original First Lien Term Facility), (ii) a $50 million senior secured revolving credit facility and (iii) a $250 million senior secured second lien term loan facility (the Original Second Lien Term Facility) (the existing facilities in clauses (a)(i) through (a)(iii), collectively, the TASC Existing Credit Facilities) and (b)(i) a new $435 million senior secured first lien term loan facility (the Incremental First Lien Term Facility), (ii) additional senior secured first lien revolving credit capacity in an aggregate principal amount of $65 million and (iii) a new $150 million senior secured second lien term loan facility (the Incremental Second Lien Term Facility) (the incremental facilities in clauses (b)(i) through (iii), collectively, the TASC Incremental Facilities and along with the TASC Existing Credit Facilities, the 2015 Credit Facility), in each case with Barclays Bank PLC as administrative agent. As of September 30, 2015 , after repayment in full of the 2013 Credit Facility (as defined below) with proceeds of the Engility Bridge Loan, which was then followed by repayment in full of the Engility Bridge Loan with proceeds of the TASC Incremental Facilities, each on February 26, 2015, our total outstanding principal balance under the 2015 Credit Facility was $1,187 million . Maturity, Interest Rate and Fees . All borrowings under the 2015 Credit Facility pursuant to the First Lien Credit Agreement bear interest at a variable rate per annum equal to an applicable margin, plus, at our option (other than for swing line loans), either (1) a base rate determined by reference to the highest of (a) the prime rate of Barclays Bank PLC, (b) the federal funds effective rate plus 0.50% and (c) a LIBOR rate determined by reference to the cost of funds for U.S. dollar deposits for the interest period of one month, plus 1.00% or (2) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing, provided that for the Original First Lien Term Facility and Incremental First Lien Term Facility, the LIBOR rate shall not be less than 1.0% . All swing line loans bear interest at a variable rate per annum equal to an applicable margin, plus a base rate determined as described in the immediately preceding sentence. The applicable LIBOR margin and the applicable base rate margin for borrowings under the First Lien Credit Agreement are 6.00% and 5.00% , respectively. All borrowings under the 2015 Credit Facility pursuant to the Second Lien Credit Agreement bear interest at a rate per annum equal to 12.00% . Guarantee and Security . All obligations under the 2015 Credit Facility are unconditionally guaranteed by TASC Parent Corporation, which was converted to a limited liability company immediately following the consummation of the acquisition of TASC (“TASC Parent LLC”), and certain of TASC Parent LLC’s existing direct or indirect wholly owned domestic subsidiaries, and will be required to be guaranteed by certain of TASC Parent LLC’s future direct or indirect wholly owned domestic subsidiaries. All obligations under the 2015 Credit Facility, and guarantees of those obligations, are secured, subject to certain exceptions, by substantially all of the assets of TASC Parent LLC and its subsidiary guarantors. In connection with the closing of the acquisition of TASC, Engility LLC and certain of its subsidiaries now guarantee and provide security for all indebtedness of TASC described above, including the 2015 Credit Facility and any financing replacing or refinancing the 2015 Credit Facility. The terms of the 2015 Credit Facility permit prepayment and termination of the loan commitments at any time, subject to certain conditions, including, but not limited to, the payment of certain prepayment and make-whole premiums. The 2015 Credit Facility also contains various covenants, including certain financial covenants, affirmative covenants with respect to certain reporting requirements and maintaining certain business activities, and negative covenants that, among other things, may limit or impose restrictions on the ability of the Company and its subsidiaries to incur liens, incur additional indebtedness, make investments, make acquisitions and undertake certain other actions. In addition, TASC Parent LLC is also subject to a passive holding company covenant that limits its ability to engage in certain activities. The 2015 Credit Facility also contains certain customary provisions related to events of default (including upon a change of control). Amortization and Final Maturity. We are required to make scheduled quarterly payments equal to 0.25% of the original principal amount of the Original First Lien Term Facility and the Incremental First Lien Term Facility under the 2015 Credit Facility, with the balance due and payable on May 22, 2020. The Original Second Lien Term Facility and Incremental Second Lien Term Facility are due on May 21, 2021. Covenants and Events of Default. The 2015 Credit Facility contains a number of covenants that, among other things and subject to certain exceptions, restrict our ability to incur additional debt; pay dividends on our capital stock or redeem, repurchase or retire our capital stock or other debt; make investments, loans and acquisitions; create restrictions on the payment of dividends or other amounts by TASC Parent LLC subsidiaries to TASC Parent LLC or to any guarantor; engage in transactions with TASC Parent LLC’s affiliates; sell assets; consolidate, merge, dissolve or wind up our business; incur liens; and prepay or amend subordinated or unsecured debt. In addition, the 2015 Credit Facility requires that TASC Parent LLC maintain a maximum consolidated total net leverage ratio of no greater than 6.75 :1.00 as of the end of any fiscal quarter of TASC Parent LLC, with step-downs to 6.50 :1.00 beginning with the fiscal quarter ended December 31, 2015, 6.00 :1.00 beginning with the fiscal quarter ending June 30, 2016 , 5.50 :1.00 beginning with the fiscal quarter ending December 31, 2016, 5.00 :1.00 beginning with the fiscal quarter ending December 31, 2017, and 4.50 :1.00 beginning with the fiscal quarter ending December 31, 2018. We believe our most restrictive covenant under the 2015 Credit Facility is the maximum consolidated total net leverage ratio, which as of September 30, 2015 was 4.45 :1.00. The consolidated total net leverage ratio is the ratio of (a) (i) funded debt as of such date minus (ii) the unrestricted cash as of such date to (b) consolidated bank EBITDA for the period of the four fiscal quarters most recently ended. In connection with the February 26, 2015 TASC Incremental Facilities, the Company expensed $5 million of deferred debt issuance costs associated with the 2013 Credit Facility. Furthermore, the Company expensed debt issuance costs of approximately $1 million that did not qualify for deferral. These amounts are reflected in interest expense, net in the Unaudited Consolidated Statements of Operations. Our weighted average outstanding loan balance for the three months ended September 30, 2015 was $1,220 million under the 2015 Credit Facility, which accrued interest at a weighted average borrowing rate of approximately 9.00% . Our weighted average outstanding loan balance for the nine months ended September 30, 2015 was $1,042 million under the 2015 Credit Facility, which accrued interest at a weighted average borrowing rate of approximately 7.90% . As of September 30, 2015 , we were in compliance with the covenants under the 2015 Credit Facility. The carrying value of the term loan excluding original issue discount approximated fair value at September 30, 2015 . The fair value of the term loan is based on quotes from a nationally recognized fixed income trading platform and is considered to be a Level 2 input, measured under U.S. GAAP hierarchy. Our availability under the revolving portion of the 2015 Credit Facility was $112 million as of September 30, 2015 , with $3 million outstanding under letters of credit. 2013 Credit Facility On August 9, 2013, Engility Holdings, Inc., as the predecessor to New Engility (Predecessor Engility), through its wholly-owned subsidiary Engility LLC (f/k/a Engility Corporation), entered into a credit facility among Predecessor Engility, Engility LLC, Bank of America, N.A. (as administrative agent, swing line lender and letter of credit issuer) and each of the several lenders from time to time party thereto, which credit facility was amended on January 31, 2014 (as amended, 2013 Credit Facility). The 2013 Credit Facility, which replaced a prior credit facility, provided for (1) a $275 million term loan facility maturing on August 9, 2018 and (2) a $325 million revolving credit facility terminating on August 9, 2018, with a $50 million letter of credit sublimit and a $25 million swing line loan sublimit. The 2013 Credit Facility also contained an accordion feature that permitted Engility LLC to arrange with the lenders for the provision of up to $150 million in additional commitments. During the three months ended September 30, 2014 , we had a weighted average outstanding loan balance of $344 million under the 2013 Credit Facility, which accrued interest at a weighted average borrowing rate of approximately 2.98% . During the nine months ended September 30, 2014 , we had a weighted average outstanding loan balance of $349 million under the 2013 Credit Facility, which accrued interest at a weighted average borrowing rate of approximately 2.89% . On February 26, 2015, the 2013 Credit Facility was repaid in connection with our entry into the TASC Incremental Facilities described above.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company utilizes fair value measurement guidance prescribed by U.S. GAAP to value its financial instruments. The guidance includes a definition of fair value, prescribes methods for measuring fair value, establishes a fair value hierarchy based on the inputs used to measure fair value and expands disclosures about the use of fair value measurements. Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. Level 3 inputs are unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. Derivatives: The Company has entered into multiple interest rate swap contracts which reduce the exposure to variability in cash flows relating to interest payments on a portion of its outstanding debt payments. These interest rate contracts are designated as cash flow hedges. The effective portion of the derivative’s gain or loss is initially reported in stockholders’ equity (as a component of accumulated other comprehensive income (loss)) and would be subsequently reclassified into earnings in the same period or periods during which the hedged forecasted transaction affects earnings. The ineffective portion of the gain or loss of a cash flow hedge would be reported in earnings. The Company does not have any derivatives outstanding that are not designated as hedges. The Company’s liabilities are measured at fair value on a recurring basis as of September 30, 2015 and February 26, 2015, the TASC acquisition date, and are aggregated by the level in the fair value hierarchy within which those measurements fall. All instruments are classified as Level 2 and there were no transfers of financial instruments between the three levels of fair value hierarchy during the period ended September 30, 2015 and February 26, 2015. The following table presents our liabilities that are measured at fair value on a recurring basis: Fair Value Hierarchy September 30, 2015 February 26, 2015 Interest rate swap liability Level 2 $ 4,499 $ 6,000 At September 30, 2015 , the balance of the interest rate swap liability consisted of $3 million included in Other Current Liabilities and $2 million included in Other Liabilities in the accompanying Unaudited Consolidated Balance Sheet. The notional amounts of derivative instruments in the Unaudited Consolidated Balance Sheet as of September 30, 2015 were $475 million . The notional amount represents the gross contract notional amount of the derivatives outstanding. The derivative instruments are comprised of $275 million of contracts effective December 31, 2014 which expire December 31, 2015, and $200 million of contracts effective December 31, 2015 which expire December 31, 2016. The other terms of these instruments are as follows: Contract received: Floating interest rate LIBOR + 3.25% Contract pay: Fixed interest rates 2.45% - 3.18% The Company has agreements with each of its derivative counterparties that contain a provision where the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness. If the Company had breached any of these provisions at September 30, 2015 , it could have been required to settle its obligations under the agreements at their termination value. As of September 30, 2015 , the termination value related to these agreements is a net liability position of $5 million . As of September 30, 2015 , the Company has not posted any collateral related to these agreements.

Restructuring and Integration C

Restructuring and Integration Costs	9 Months Ended
	Sep. 30, 2015
Restructuring and Related Activities [Abstract]
Restructuring and Integration Costs	Restructuring and Integration Costs 2015 Costs During the nine months ended September 30, 2015 in conjunction with the integration of TASC, we incurred $18 million in restructuring costs, including costs related to workforce reduction which will be paid out over the next 12 months, and other costs to include contract and lease termination fees. 2014 Costs During the year ended December 31, 2014 in conjunction with the integration of DRC, and our move to a customer focused model, we incurred $1 million in restructuring costs, including costs related to workforce reduction. 2013 Costs During the fourth quarter of 2013, we classified several leased facilities as abandoned and recorded a charge of $8 million which will be amortized over the next six years. The accrued liability is amortized and reduces the current period expense as we make scheduled lease payments. The activity and balance of the restructuring liability account for the nine months ended September 30, 2015 were as follows: Severance and Related Costs Other Restructuring Costs Total Balance as of December 31, 2013 $ 337 $ 7,533 $ 7,870 Additions 1,134 — 1,134 Cash payments (1,103 ) (1,497 ) (2,600 ) Balance as of December 31, 2014 368 6,036 6,404 Additions 14,773 2,980 17,753 Cash payments (9,929 ) (2,860 ) (12,789 ) Balance as of September 30, 2015 $ 5,212 $ 6,156 $ 11,368 Amounts contained in the current liabilities line of our balance sheet as of September 30, 2015 $ 5,212 $ 1,901 $ 7,113 Amounts contained in the other liabilities line of our balance sheet as of September 30, 2015 $ — $ 4,255 $ 4,255 These expenses are contained within the selling, general and administrative expenses line in the accompanying Unaudited Consolidated Statement of Operations for the appropriate period.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Procurement Regulations: Most of our revenue is generated from providing services and products under legally binding agreements or contracts with U.S. government and foreign government customers. U.S. government contracts are subject to extensive legal and regulatory requirements, and from time to time, agencies of the U.S. government investigate whether such contracts were and are being conducted in accordance with these requirements. We are currently cooperating with the U.S. government on several investigations from which civil or administrative proceedings have or could result and give rise to fines, penalties, compensatory and treble damages, restitution and/or forfeitures. We do not currently anticipate that any of these investigations will have a material adverse effect, individually or in the aggregate, on our consolidated financial position, results of operations or cash flows. However, under U.S. government regulations, our indictment by a federal grand jury, or an administrative finding against us as to our present responsibility to be a U.S. government contractor or subcontractor, could result in our suspension for a period of time from eligibility for awards of new government contracts or task orders or in a loss of export privileges. A conviction, or an administrative finding against us that satisfies the requisite level of seriousness, could result in debarment from contracting with the U.S. government for a specified term, which would have a materially adverse effect on our consolidated financial position, results of operations and cash flows. In addition, all of our U.S. government contracts: (1) are subject to audit and various pricing and cost controls, (2) include standard provisions for termination for the convenience of the U.S. government or for default, and (3) are subject to cancellation if funds for contracts become unavailable. Foreign government contracts generally include comparable provisions relating to terminations for convenience and default, as well as other procurement clauses relevant to the foreign government. We currently have a dispute with a foreign government over the satisfactory performance of a contract that may have an adverse impact to Engility of up to $7 million on our future results. Litigation and Other Matters: We are also subject to litigation, proceedings, claims or assessments and various contingent liabilities incidental to our businesses. We are subject to claims from jurisdictions where we presently have or previously had operations for charges and fees such as non-income-related taxes. We accrue for these liabilities when they are probable and reasonably estimable. These accrued liabilities are increased or decreased based on claims, as new facts are determined which impact these liabilities, and final settlement or resolution could differ materially. Furthermore, in connection with certain business acquisitions, we have assumed some or all claims against, and liabilities of, such acquired businesses, including both asserted and unasserted claims and liabilities. In accordance with the accounting standard for contingencies, we record a liability when management believes that it is both probable that a liability has been incurred and we can reasonably estimate the amount of the loss. Generally, the loss is recorded for the amount we expect to resolve the liability. The estimated amounts of liabilities recorded for pending and threatened litigation are recorded in other current liabilities in the consolidated balance sheets. Amounts recoverable from insurance contracts or third parties are recorded as assets when deemed probable. At December 31, 2014 and September 30, 2015 , we did not record any amounts for recoveries from insurance contracts or third parties in connection with the amount of liabilities recorded for pending and threatened litigation. Legal defense costs are expensed as incurred. We believe we have recorded adequate provisions for our litigation matters. We review these provisions quarterly and adjust these provisions to reflect the effect of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three months ended September 30, 2015 was (51.1)% as compared to 39.0% for the three months ended September 30, 2014. The decrease in the effective tax rate, which includes the effects of discrete items, was primarily due to a decrease in pre-tax income and an increased tax benefit related to our joint venture as a percentage of total earnings in the three months ended September 30, 2015, as compared to the three months ended September 30, 2014. The effective tax rate for the nine months ended September 30, 2015 was 197.8% as compared to 39.1% for the nine months ended September 30, 2014. The increase in the effective tax rate, was primarily due to a decrease in pre-tax income, an increased tax benefit related to our joint venture as a percentage of total earnings, and a liability reversal for uncertain tax positions relating to a 2010 and 2011 IRS income tax audit settlement for the nine months ended September 30, 2015, as compared to the nine months ended September 30, 2014. The Company continues to benefit from tax attributes acquired with the acquisition of TASC, including net operating losses (“NOLs”). These tax assets are expected to significantly reduce net cash tax payments through 2024.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business: Engility Holdings, Inc. (Engility) has provided mission critical services to the U.S. government for over six decades. Engility serves among other federal agencies, the U.S. Department of Defense (DoD), U.S. Department of Justice (DoJ), U.S. Agency for International Development (USAID), U.S. Department of State (DoS), Federal Aviation Administration (FAA) and Department of Homeland Security (DHS). With Engility's acquisition of TASC, Inc. (TASC) on February 26, 2015, Engility further diversified its portfolio to add leading positions with U.S. national security, public safety and space-related agencies. These agencies include the National Geospatial-Intelligence Agency (NGA), National Security Agency (NSA), Defense Intelligence Agency (DIA), National Reconnaissance Office (NRO), National Aeronautical and Space Administration (NASA), and U.S. Air Force. The acquisition of TASC also enhanced Engility's market position with DHS, Defense Threat Reduction Agency (DTRA), FAA, and Missile Defense Agency (MDA). As used herein, the terms “Engility,” the “Company,” “we,” “us” or “our” refers to (i) Engility and its subsidiaries, for all periods prior to the closing of the TASC acquisition, and (ii) New Engility and its subsidiaries, for all periods following the TASC acquisition. The TASC acquisition was effected through a new holding company named New East Holdings, Inc. (New Engility). As a result of the business combination, New Engility succeeded to and continues to operate, directly or indirectly, the existing business of Engility and, indirectly, acquired the existing business of TASC.
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation: The Unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and in accordance with Article 10 of Regulation S-X of the U.S. Securities and Exchange Commission (SEC), and reflect the financial position, results of operations and cash flows of our businesses. Accordingly, they do not include all of the disclosures required by U.S. GAAP for a complete set of annual audited financial statements. All significant intercompany accounts and transactions are eliminated in consolidation. The Unaudited Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. On January 31, 2014 and February 26, 2015, we completed the acquisitions of Dynamics Research Corporation (DRC) and TASC, respectively, which are more fully described in Note 3 to the accompanying Unaudited Consolidated Financial Statements. These transactions were recorded using the purchase method of accounting; accordingly, DRC's and TASC's financial results are included in the Unaudited Consolidated Financial Statements for the periods subsequent to the acquisition. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in our Annual Report on Form 10-K/A filed with the SEC on November 4, 2015 for the year ended December 31, 2014 (2014 Form 10-K/A). In the opinion of management, all adjustments (consisting of normal and recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included.
Change in Accounting Principle for Revenue Recognition and Revenue Recognition	Change in Accounting Principle for Revenue Recognition: As of January 1, 2015, we changed our methodology of recognizing revenue for all of our U.S. government contracts to apply the accounting guidance of Financial Accounting Standards Board (FASB), Accounting Standard Codification (ASC), Subtopic 605-35, as directed by ASC Topic 912, which permits revenue recognition on a percentage-of-completion basis. Previously, we applied this guidance only to contracts related to the construction or development of tangible assets. For contracts not related to those activities, we had applied the general revenue recognition guidance of Staff Accounting Bulletin (SAB), Topic 13, “Revenue Recognition.” We believe that the application of contract accounting under ASC 605-35 to all U.S. government contracts is preferable to the application of contract accounting under SAB Topic 13, based on the fact that the percentage of completion model utilized under ASC 605-35 is a recognized accounting model that better reflects the economics of a U.S. government contract during the contract performance period and better aligns Engility’s revenue policy with its peers. The financial impact resulting from the accounting change was immaterial to our financial statements. Revenue Recognition: Substantially all of the Company’s revenue is derived from services provided to the U.S. government and its agencies, primarily by the Company’s consulting staff and, to a lesser extent, subcontractors. The Company generates its revenue from the following types of contractual arrangements: cost-reimbursable-plus-fee contracts, time-and-materials contracts, and fixed-price contracts. Revenue on cost-reimbursable-plus-fee contracts is recognized as services are performed, generally based on allowable costs plus any recognizable earned fee. The Company considers fixed fees under cost-reimbursable-plus-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract. For cost-reimbursable-plus-fee contracts that include performance-based fee incentives, which are principally award fee arrangements, the Company recognizes income when such fees are probable and estimable. Estimates of the total fee to be earned are made based on contract provisions, prior experience with similar contracts or clients, and management’s evaluation of the performance on such contracts. Revenue for time-and-materials contracts is recognized as services are performed, generally on the basis of contract allowable labor hours worked multiplied by the contract-defined billing rates, plus allowable direct costs and indirect cost allocations associated with materials used and other direct expenses incurred in connection with the performance of the contract. Revenue on fixed-price contracts is recognized using percentage-of-completion based on actual costs incurred relative to total estimated costs for the contract. These estimated costs are updated during the term of the contract, and may result in revision by the Company of recognized revenue and estimated costs in the period in which they are identified. Profits on fixed-price contracts result from the difference between incurred costs and revenue earned. Contract accounting requires significant judgment relative to assessing risks, estimating contract revenue and costs, and making assumptions for schedule and technical issues. Due to the size and nature of many of the Company’s contracts, developing total revenue and cost at completion estimates requires the use of significant judgment. Contract costs include direct labor and billable expenses, an allocation of allowable indirect costs, and warranty obligations. Billable expenses are comprised of subcontracting costs and other direct costs that often include, but are not limited to, travel-related costs and telecommunications charges. The Company recognizes revenue and billable expenses from these transactions on a gross basis. Assumptions regarding the length of time to complete the contract also include expected increases in wages and prices for materials. Estimates of total contract revenue and costs are monitored during the term of the contract and are subject to revision as the contract progresses. Anticipated losses on contracts are recognized in the period they are deemed probable and can be reasonably estimated. The Company’s contracts may include the delivery of a combination of one or more of the Company’s service offerings. In these situations, the Company determines whether such arrangements with multiple service offerings should be treated as separate units of accounting based on how the elements are bid or negotiated, whether the customer can accept separate elements of the arrangement, and the relationship between the pricing on the elements individually and combined. Included in unbilled receivables, a component of receivables, net, are certain restructuring costs related to the performance of our U.S. Government contracts which are required to be recorded under GAAP but are not currently allocable to contracts. Such costs are expensed outside of our indirect rates and recognized as revenue for the portion we expect to be recoverable in our rates. At September 30, 2015 and December 31, 2014, these costs were approximately $8 million and $0 million , respectively. These costs are allocated to contracts when they are paid or otherwise agreed. We regularly assess the probability of recovery of these costs. This assessment requires us to make assumptions about the extent of cost recovery under our contracts and the amount of future contract activity. If the level of backlog in the future does not support the continued expensing of these costs, the profitability of our remaining contracts could be adversely affected. Revenue and profit in connection with contracts to provide services to the U.S. government that contain collection risk because the contracts are incrementally funded and subject to the availability of funds appropriated are deferred until a contract modification is obtained, indicating that adequate funds are available to the contract or task order.
Non-controlling Interest	Non-controlling Interest: Engility holds a 50.1% majority interest in Forfeiture Support Associates, LLC (FSA). The results of operations of FSA are included in Engility’s Unaudited Consolidated Financial Statements. The non-controlling interest reported on the Unaudited Consolidated Balance Sheets represents the portion of FSA’s equity that is attributable to the non-controlling interest.
Accounting Estimates	Accounting Estimates: The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates using 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 revenue and expenses during the reporting periods. The most significant of these estimates relate to the recoverability, useful lives and valuation of identifiable intangible assets and goodwill, income tax contingencies and revenue and expenses for certain revenue arrangements. Actual amounts may differ from these estimates and could differ materially.
Earnings Per Share	Earnings per Share: Basic earnings per share (EPS) is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted EPS reflects potential dilution that could occur if securities to issue common stock were exercised or converted into common stock. Diluted EPS includes the effect of the employee stock purchase plan, restricted stock units (RSU), stock options, performance shares and performance units calculated using the treasury stock method. No shares were excluded from diluted EPS for both the three and nine months ended September 30, 2015 and 2014.
New Accounting Pronouncements	New Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU 2014-09 outlines a single comprehensive model for entities to use when accounting for revenue arising from contracts with customers and supersedes all current revenue recognition guidance, including industry-specific guidance. In July 2015, the FASB deferred the effective date of the updated by one year. This new guidance is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017; early adoption is not permitted. Entities have the option of using either a full retrospective or a modified approach to adopt the guidance. This update could impact the timing and amounts of revenue recognized. We are currently evaluating the effect that implementation of this update will have on our consolidated financial position and results of operations upon adoption. In June 2014, the FASB issued ASU No. 2014-12, Compensation - Stock Compensation (Topic 718) - Accounting for Share-based Payments when Terms of an award Provide That a Performance Target Could be Achieved after the Requisite Service Period. The Amendments in ASU 2014-12 require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. ASU 2014-12 is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. We do not expect this pronouncement to have a material impact on our financial statements. In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. The guidance requires an entity to evaluate whether there are conditions or events, in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued (or within one year after the financial statements are available to be issued when applicable) and to provide related footnote disclosures in certain circumstances. The guidance is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter. Early application is permitted. We do not believe the adoption of this guidance will have a significant impact on our consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-03, Interest—Imputation of Interest , which changes the presentation of debt issuance costs in financial statements. The amendments in this standard require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this standard. The guidance is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter. We do not believe the adoption of this guidance will have a significant impact on our consolidated financial statements. In August 2015, the FASB issued ASU No. 2015-15, Interest-Imputation of Interest: Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting , which addresses line-of-credit arrangements that were omitted from ASU 2015-03 (see above). This Update states that the SEC staff would not object to an entity deferring and presenting debt issuance costs related to a line-of-credit arrangement as an asset and subsequently amortizing those costs ratably over the term of the arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. We do not believe the adoption of this guidance will have a significant impact on our consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement Period Adjustments (Topic 805) . ASU 2015-16 requires an acquirer in a business combination to recognize provisional amounts when measurements were incomplete as of the end of a reporting period as an adjustment in the reporting period in which the provisional amount is determined. Prior to this standard, the acquirer was required to adjust such provisional amounts by restating prior period financial statements. ASU 2015-16 is effective for the annual period ending December 31, 2016 and for annual periods and interim periods thereafter with early adoption permitted. We do not believe the adoption of this guidance will have a significant impact on our consolidated financial statements.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Earnings Per Share	Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Net income attributable to Engility $ 3,650 $ 13,161 $ 3,379 $ 32,937 Weighted average number of shares outstanding – Basic 36,623 17,151 32,527 17,080 Dilutive effect of share-based compensation outstanding after application of the treasury stock method 513 914 538 914 Weighted average number of shares – Diluted 37,136 18,065 33,065 17,994 Earnings per share attributable to Engility Basic $ 0.10 $ 0.77 $ 0.10 $ 1.93 Diluted $ 0.10 $ 0.73 $ 0.10 $ 1.83

Business Acquisitions (Tables)

Business Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2015
Business Acquisition [Line Items]
Summary of Preliminary Allocation of Purchase Price	The preliminary allocation of purchase price is as follows: Number of Engility shares issued 18,937,765 Share price on February 26, 2015 $ 46.45 Dividend payable to Engility stockholders 11.434 Value of Engility shares issued to TASC stockholders $ 35.016 Equity consideration $ 663,125 Cash $ 25,478 Receivables 149,041 Prepaid and deferred income taxes, current 26,015 Other current assets 26,286 Property, plant and equipment 15,835 Deferred tax assets 176,218 Other assets 5,096 Current portion of long-term debt (4,097 ) Accounts payable, trade (34,503 ) Accrued employment costs (92,396 ) Accrued expenses (33,387 ) Advance payments and billings in excess of costs incurred (18,004 ) Deferred income taxes, current and income taxes payable (248 ) Other current liabilities (32,522 ) Long-term debt (619,227 ) Other long-term liabilities (24,446 ) Identifiable intangible assets 360,400 Goodwill 737,586 $ 663,125
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	The valuation of the identified intangible assets acquired is summarized below: Useful Life (years) Customer contractual relationships 15 $ 335,700 Contractual backlog 1 17,700 Technology 15 7,000 Total intangible assets $ 360,400
Business Acquisition Pro Forma Information	The following pro forma results of operations have been prepared as though the acquisition of TASC had occurred on January 1, 2014. These pro forma results include adjustments for (1) amortization expense for the estimated identifiable intangible assets in the preliminary allocation of purchase price, (2) the removal of historical TASC amortization expense, (3) adjustments to conform TASC policies to Engility's policies related to the timing and recognition of certain contract revenue and costs, (4) the alignment of TASC’s financial calendar to that of Engility’s and 5) the removal of acquisition-related expenses incurred and recorded in each of TASC and Engility’s results of operations in the three and nine months ended September 30, 2015 , and a related adjustment to record such costs in the three and nine months ended September 30, 2014 . The pro forma results of operations also include adjustments to reflect the acquisition of DRC as though the acquisition occurred on January 1, 2013. These pro forma results include adjustments for (1) amortization expense for the identifiable intangible assets in the final purchase price allocation, (2) the removal of historical DRC amortization expense, and (3) the removal of acquisition-related expenses incurred and recorded on each of DRC and Engility’s results of operations in the nine months ended September 30, 2014 . This pro forma information does not purport to be indicative of the results of operations that would have been attained had the acquisitions been made as of January 1, 2014 and January 1, 2013 respectively, or of results of operations that may occur in the future. Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Revenue $ 569,108 $ 618,946 $ 1,705,411 $ 1,895,698 Operating income 40,443 36,519 112,262 64,574

Receivables (Tables)

Receivables (Tables)	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Components of Contract Receivables	The components of contract receivables are presented in the table below. As of As of Billed receivables $ 118,657 $ 115,500 Unbilled receivables 273,119 172,385 Allowance for doubtful accounts (2,366 ) (1,482 ) Total receivables, net $ 389,410 $ 286,403

Goodwill and Identifiable Int24

Goodwill and Identifiable Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Information on Identifiable Intangible Assets	Information on our identifiable intangible assets that are subject to amortization is presented in the table below. September 30, 2015 December 31, 2014 Weighted Average Amortization Period Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount (in years) Customer contractual relationships 17 $ 556,430 $ 119,036 $ 437,394 $ 220,730 $ 97,523 $ 123,207 Contractual backlog 1 21,800 14,425 7,375 4,100 3,758 342 Technology 15 7,000 272 6,728 — — — Total $ 585,230 $ 133,733 $ 451,497 $ 224,830 $ 101,281 $ 123,549
Amortization Expense Recorded for Identifiable Intangible Assets	Our amortization expense recorded for our identifiable intangible assets is presented in the table below. Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Amortization expense $ 12,944 $ 3,851 $ 32,452 $ 11,006

Defined Benefit Pension Plan (T

Defined Benefit Pension Plan (Tables)	9 Months Ended
	Sep. 30, 2015
Postemployment Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures	The components of net periodic pension income for the DRC pension plan are as follows: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Interest cost on projected benefit obligation $ 1,000 $ 979 $ 2,998 $ 2,610 Expected return on plan assets (1,458 ) (1,457 ) (4,375 ) (3,883 ) Net loss amortization 57 — 173 — Net periodic pension expense (income) $ (401 ) $ (478 ) $ (1,204 ) $ (1,273 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following table presents our liabilities that are measured at fair value on a recurring basis: Fair Value Hierarchy September 30, 2015 February 26, 2015 Interest rate swap liability Level 2 $ 4,499 $ 6,000

Restructuring and Integration27

Restructuring and Integration Costs (Tables)	9 Months Ended
	Sep. 30, 2015
Restructuring and Related Activities [Abstract]
Summary of Realignment Cost	The activity and balance of the restructuring liability account for the nine months ended September 30, 2015 were as follows: Severance and Related Costs Other Restructuring Costs Total Balance as of December 31, 2013 $ 337 $ 7,533 $ 7,870 Additions 1,134 — 1,134 Cash payments (1,103 ) (1,497 ) (2,600 ) Balance as of December 31, 2014 368 6,036 6,404 Additions 14,773 2,980 17,753 Cash payments (9,929 ) (2,860 ) (12,789 ) Balance as of September 30, 2015 $ 5,212 $ 6,156 $ 11,368 Amounts contained in the current liabilities line of our balance sheet as of September 30, 2015 $ 5,212 $ 1,901 $ 7,113 Amounts contained in the other liabilities line of our balance sheet as of September 30, 2015 $ — $ 4,255 $ 4,255

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	Feb. 26, 2015	Sep. 30, 2015	Dec. 31, 2014
Basis of Presentation [Line Items]
Common stock ownership, percent	99.00%
Restructuring costs incurred		$ 8	$ 0
Non-controlling equity interest ownership percentage		50.10%
Increase in revenue		$ 7
TASC
Basis of Presentation [Line Items]
Common stock ownership, percent		100.00%

Basis of Presentation - Earning

Basis of Presentation - Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income attributable to Engility	$ 3,650	$ 13,161	$ 3,379	$ 32,937
Weighted average number of shares outstanding - Basic (shares)	36,623	17,151	32,527	17,080
Dilutive effect of share-based compensation outstanding after application of the treasury stock method (shares)	513	914	538	914
Weighted average number of shares - Diluted (shares)	37,136	18,065	33,065	17,994
Earnings per share attributable to Engility
Basic (USD per share)	$ 0.10	$ 0.77	$ 0.10	$ 1.93
Diluted (USD per share)	$ 0.10	$ 0.73	$ 0.10	$ 1.83

Business Acquisitions - TASC Ac

Business Acquisitions - TASC Acquisition (Details) $ / shares in Units, employee in Thousands, $ in Thousands	Feb. 26, 2015USD ($)employeeboard_member$ / sharesshares	Sep. 30, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)
Business Acquisition [Line Items]
Common stock ownership, percent	99.00%
Number of Board members eligible to be nominated | board_member	11
Dividends paid				$ 204,300	$ 0
Number of Board members eligible to be nominated by Engility directors | board_member	7
Number of Board members eligible to be nominated, by Birch Partners | board_member	4
TASC
Business Acquisition [Line Items]
Number of employees | employee	4
Common stock ownership, percent	52.00%
Number of Engility shares issued | shares	18,937,765
Equity consideration	$ 663,000
Debt assumed	623,000
Special dividend value	$ 207,000
Dividend payable to Engility stockholders (USD per share) | $ / shares	$ 11.434
Dividends paid				203,000
Common stock ownership, maximum percent. before consensus voting	30.00%
Revenue of acquiree since acquisition date		$ 271,000	$ 641,000
Pre-tax net income of acquiree since acquisition		15,000	$ 38,000
Acquisitions costs		$ 16,000		$ 59,000
TASC | Minimum
Business Acquisition [Line Items]
Common stock ownership, percent required to consensus voting	21.00%
TASC | Maximum
Business Acquisition [Line Items]
Common stock ownership, percent required to consensus voting	21.50%
TASC | Birch Partners, LP And Kohlberg Kravis Roberts & Co. L.P.
Business Acquisition [Line Items]
Number of Board members eligible to be nominated | board_member	4
TASC | Birch Partners, LP And Kohlberg Kravis Roberts & Co. L.P. | Minimum
Business Acquisition [Line Items]
Business combination, period in which ownership can not be transferred	1 year
Business combination, period in which limited ownership can be transferred	4 years
TASC | Birch Partners, LP And Kohlberg Kravis Roberts & Co. L.P. | Maximum
Business Acquisition [Line Items]
Business combination, period in which ownership can not be transferred	3 years
Business combination, period in which limited ownership can be transferred	6 years
TASC | Birch Partners, LP And Kohlberg Kravis Roberts & Co. L.P. | Scenario 1
Business Acquisition [Line Items]
Common stock ownership, percent	50.00%
Number of Board members eligible to be nominated | board_member	4
TASC | Birch Partners, LP And Kohlberg Kravis Roberts & Co. L.P. | Scenario 2
Business Acquisition [Line Items]
Common stock ownership, percent	25.00%
Number of Board members eligible to be nominated | board_member	2

Business Acquisitions - Purchas

Business Acquisitions - Purchase Price Allocation (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 26, 2015	Sep. 30, 2015	Dec. 31, 2014
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill		$ 1,382,140	$ 644,554
TASC
Business Combination, Consideration Transferred [Abstract]
Number of Engility shares issued	18,937,765
Share price (USD per share)	$ 46.45
Dividend payable to Engility stockholders (USD per share)	11.434
Value of Engility shares issued to TASC stockholders (USD per share)	$ 35.016
Consideration transferred	$ 663,125
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash	25,478
Receivables	149,041
Prepaid and deferred income taxes, current	26,015
Other current assets	26,286
Property, plant and equipment	15,835
Deferred tax assets	176,218
Other assets	5,096
Current portion of long-term debt	(4,097)
Accounts payable, trade	(34,503)
Accrued employment costs	(92,396)
Accrued expenses	(33,387)
Advance payments and billings in excess of costs incurred	(18,004)
Deferred income taxes, current and income taxes payable	(248)
Other current liabilities	(32,522)
Long-term debt	(619,227)
Other long-term liabilities	(24,446)
Identifiable intangible assets	360,400
Goodwill	737,586
Net assets acquired	$ 663,125

Business Acquisitions - Intangi

Business Acquisitions - Intangible Assets (Details) - TASC $ in Thousands	Feb. 26, 2015USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets acquired in a business combination	$ 360,400
Customer contractual relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (years)	15 years
Finite lived intangible assets acquired in a business combination	$ 335,700
Contractual backlog
Finite-Lived Intangible Assets [Line Items]
Useful Life (years)	1 year
Finite lived intangible assets acquired in a business combination	$ 17,700
Technology
Finite-Lived Intangible Assets [Line Items]
Useful Life (years)	15 years
Finite lived intangible assets acquired in a business combination	$ 7,000

Business Acquisitions - DRC Acq

Business Acquisitions - DRC Acquisition (Details) - Dynamics Research Corporation - USD ($) $ / shares in Units, $ in Millions	Jan. 31, 2014	Sep. 30, 2014
Business Acquisition [Line Items]
Price per share (USD per share)	$ 11.50
Aggregate cash purchase price	$ 207
Debt assumed in a business combination	$ 86
Revenue of acquiree since acquisition date		$ 164
Pre-tax net loss of acquiree since acquisition		$ (5)

Business Acquisitions - Pro For

Business Acquisitions - Pro Forma (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Revenue	$ 569,108	$ 618,946	$ 1,705,411	$ 1,895,698
Net income attributable to Engility	$ 40,443	$ 36,519	$ 112,262	$ 64,574

Receivables - Components of Con

Receivables - Components of Contract Receivables (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Billed receivables	$ 118,657	$ 115,500
Unbilled receivables	273,119	172,385
Allowance for doubtful accounts	(2,366)	(1,482)
Total receivables, net	$ 389,410	$ 286,403

Goodwill and Identifiable Int36

Goodwill and Identifiable Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Feb. 26, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 1,382,140		$ 644,554
TASC
Goodwill [Line Items]
Goodwill		$ 737,586
Goodwill acquired in a business combination	$ 738,000

Goodwill and Identifiable Int37

Goodwill and Identifiable Intangible Assets - Information on Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 585,230	$ 224,830
Accumulated Amortization	133,733	101,281
Net Carrying Amount	$ 451,497	123,549
Customer contractual relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	17 years
Gross Carrying Amount	$ 556,430	220,730
Accumulated Amortization	119,036	97,523
Net Carrying Amount	$ 437,394	123,207
Contractual backlog
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	1 year
Gross Carrying Amount	$ 21,800	4,100
Accumulated Amortization	14,425	3,758
Net Carrying Amount	$ 7,375	342
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	15 years
Gross Carrying Amount	$ 7,000	0
Accumulated Amortization	272	0
Net Carrying Amount	$ 6,728	$ 0

Goodwill and Identifiable Int38

Goodwill and Identifiable Intangible Assets - Amortization Expense Recorded for Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 12,944	$ 3,851	$ 32,452	$ 11,006

Share-Based Compensation - Effe

Share-Based Compensation - Effects of TASC Acquisition on Engility Equity Awards (Details) - shares	Feb. 26, 2015	Sep. 30, 2015	Sep. 30, 2014
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting as a result of change in control	364,983
Restricted Stock Units | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares in which vesting was waived	229,166
Restricted Stock Units | Independent Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting as a result of change in control	43,950
Shares in which vesting was waived	11,790
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the target grant amount	127.00%	200.00%	200.00%
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the target grant amount	100.00%	0.00%	0.00%

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Detail) - $ / shares	Feb. 26, 2015	Sep. 30, 2015	Sep. 30, 2014
Performance Retention Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in the period		212,963
Shares granted at maximum performance level		425,926
Weighted average share price (USD per share)		$ 32.82
Vesting period		3 years
Performance period		3 years
Performance Retention Award | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the target grant amount		50.00%
Performance Retention Award | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the target grant amount		200.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in the period		195,814	102,961
Shares granted at maximum performance level		431,658	205,922
Weighted average share price (USD per share)		$ 32.29	$ 56.14
Vesting period	3 years
Performance period		3 years	3 years
Adjustment to target number of performance units, percent		25.00%
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the target grant amount	100.00%	0.00%	0.00%
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of the target grant amount	127.00%	200.00%	200.00%
Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in the period		127,899	74,086
Weighted average share price (USD per share)		$ 32.82	$ 44.33
Performance period		3 years	3 years
Stock vest on first anniversary		25.00%	25.00%
Stock vest on second anniversary		25.00%	25.00%
Stock vest on third anniversary		50.00%	50.00%
RSUs granted that vest ratably over the term of three years from the grant date			68,633
Restricted Stock Units | Non-management Members Of The Board Of DIrectors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in the period		24,703	11,790
Weighted average share price (USD per share)		$ 28.34	$ 38.16
Performance period		1 year	1 year
Restricted Stock Units Rsu Cliff Vest | Non-executive Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted that cliff vest on third anniversary of grant date			1,217
Restricted stock units granted that cliff vest on first anniversary of grant date			4,236

Defined Benefit Pension Plan (D

Defined Benefit Pension Plan (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Postemployment Benefits [Abstract]
Interest cost on projected benefit obligation	$ 1,000	$ 979	$ 2,998	$ 2,610
Expected return on plan assets	(1,458)	(1,457)	(4,375)	(3,883)
Net loss amortization	57	0	173	0
Net periodic pension expense (income)	(401)	$ (478)	(1,204)	$ (1,273)
Acquired pension plan balance	$ 21,000		$ 21,000

Debt (Details)

Debt (Details)	Feb. 26, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Aug. 09, 2013USD ($)
Debt Instrument [Line Items]
Gross borrowings from issuance of long-term debt				$ 585,000,000	$ 75,000,000
Credit Facility 2015
Debt Instrument [Line Items]
Line of credit, amount outstanding		$ 1,187,000,000		$ 1,187,000,000
Quarterly principal payments percentage	0.25%
Maximum net leverage ratio	6.75
Maximum net leverage ratio, requirement one	6.50
Maximum net leverage ration, requirement two	6
Maximum net leverage ratio, requirement three	5.50
Maximum net leverage ratio, requirement four	5
Maximum net leverage ratio, requirement five	4.50
Net leverage ratio		4.45		4.45
Debt issuance costs				$ 1,000,000
Average outstanding loan amount		$ 1,220,000,000		$ 1,042,000,000
Weighted average borrowing rate		9.00%		7.90%
Line of credit, remaining borrowing capacity		$ 112,000,000		$ 112,000,000
Letters of credit outstanding		$ 3,000,000		3,000,000
Credit Facility 2015 | Federal Funds Effective Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Credit Facility 2015 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Variable Rate Floor	1.00%
First Lien Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	6.00%
First Lien Credit Agreement | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	5.00%
Second Lien Credit Agreement
Debt Instrument [Line Items]
Stated interest rate	12.00%
2013 Credit Facility
Debt Instrument [Line Items]
Debt issuance costs				$ 5,000,000
Sublimit for letters of credit						$ 50,000,000
Line of credit facility borrowing capacity available for swing line loans under revolving credit facility						25,000,000
Line of credit facility accordion feature, additional borrowing capacity						150,000,000
Secured Debt | Original First Lien Term Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 395,000,000
Secured Debt | Incremental First Lien Term Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	435,000,000
Secured Debt | Incremental Second Lien Term Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	150,000,000
Secured Debt | 2013 Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						275,000,000
Average outstanding loan amount			$ 344,000,000		$ 349,000,000
Weighted average borrowing rate			2.98%		2.89%
Revolving Credit Facility | First Lien Credit Agreement and Second Lien Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	50,000,000
Revolving Credit Facility | Additional Senior Secured First Lien Revolving Credit Capacity
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	65,000,000
Revolving Credit Facility | Original Second Lien Term Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	250,000,000
Revolving Credit Facility | 2013 Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 325,000,000
Promissory Note
Debt Instrument [Line Items]
Gross borrowings from issuance of long-term debt	$ 585,000,000

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Feb. 26, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liability	$ 5,000
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liability	$ 4,499	$ 6,000

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Feb. 26, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liability	$ 5,000
Derivative liability, notional amount	$ 475,000
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, fixed interest rate	2.45%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, fixed interest rate	3.18%
London Interbank Offered Rate (LIBOR)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, basis spread on variable interest rate	3.25%
Interest Rate Swap Effective December 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount	$ 275,000
Interest Rate Swap Effective December 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, notional amount	200,000
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liability	4,499	$ 6,000
Other Current Liabilities | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liability	3,000
Other Liabilities | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liability	$ 2,000

Restructuring and Integration45

Restructuring and Integration Costs (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2015	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Lease abandonment charge	$ 8,000
Lease abandonment charger amortization period	6 years
Restructuring Cost and Reserve [Line Items]
Restructuring costs			$ 1,000
Restructuring Reserve [Roll Forward]
Beginning Balance		$ 6,404	7,870
Additions		17,753	1,134
Cash payments		(12,789)	(2,600)
Ending Balance	$ 7,870	11,368	6,404
Other Current Liabilities
Restructuring Reserve [Roll Forward]
Ending Balance		7,113
Other Liabilities
Restructuring Reserve [Roll Forward]
Ending Balance		4,255
Severance and Related Costs
Restructuring Reserve [Roll Forward]
Beginning Balance		368	337
Additions		14,773	1,134
Cash payments		(9,929)	(1,103)
Ending Balance	337	5,212	368
Severance and Related Costs | Other Current Liabilities
Restructuring Reserve [Roll Forward]
Ending Balance		5,212
Severance and Related Costs | Other Liabilities
Restructuring Reserve [Roll Forward]
Ending Balance		0
Other Restructuring Costs
Restructuring Reserve [Roll Forward]
Beginning Balance		6,036	7,533
Additions		2,980	0
Cash payments		(2,860)	(1,497)
Ending Balance	$ 7,533	6,156	$ 6,036
Other Restructuring Costs | Other Current Liabilities
Restructuring Reserve [Roll Forward]
Ending Balance		1,901
Other Restructuring Costs | Other Liabilities
Restructuring Reserve [Roll Forward]
Ending Balance		4,255
TASC
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 18,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details)	Sep. 30, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
Estimate of adverse impact	$ 7,000,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	(51.10%)	39.00%	197.80%	39.10%