Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial statements and pursuant to the rules and regulations of the Securities and Exchange Commission. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments consisting of normal recurring adjustments necessary for a fair presentation of its financial position and results of operations and cash flows for the periods presented. Interim results of operations are not necessarily indicative of the results that may be achieved for the full year. The financial statements and related notes do not include all information and footnotes required by GAAP for annual reports. This quarterly report should be read in conjunction with the consolidated financial statements included in the Company’s annual report on Form 10-K for the year ended December 31, 2014. The Company uses a 52- or 53-week fiscal year ending on the last Wednesday of the calendar year. In a 52-week fiscal year, each quarter includes 13 weeks of operations; in a 53-week fiscal year, the first, second and third quarters each include 13 weeks of operations and the fourth quarter includes 14 weeks of operations. Every six or seven years a 53-week fiscal year occurs. Fiscal 2014, which was a 53-week year, ended on December 31, 2014. Fiscal 2015, which is a 52-week year, will end on December 30, 2015. Because fiscal 2014 was a 53-week year, both revenues and expenses, and other financial and operational figures, may be on an elevated scale compared with 52-week periods both before and after. On April 22, 2014, Chicken Acquisition Corp. (“CAC”), which was a predecessor of Holdings, as well as its wholly owned subsidiary, Chicken Subsidiary Corp (“CSC”) and CSC’s wholly owned subsidiary, the former El Pollo Loco Holdings, Inc. (“Old Holdings”) entered into the following reorganization transactions: (i) Old Holdings merged with and into CSC with CSC continuing as the surviving corporation; (ii) CSC merged with and into CAC with CAC continuing as the surviving corporation and (iii) CAC renamed itself El Pollo Loco Holdings, Inc. Holdings has no material assets or operations. Holdings and Holdings’ direct subsidiary, EPL Intermediate, Inc. (“Intermediate”), guarantee EPL’s 2014 Revolver (see Note 4) on a full and unconditional basis and Intermediate has no subsidiaries other than EPL. EPL is a separate and distinct legal entity, and has no obligation to make funds available to Intermediate EPL and Intermediate may pay dividends to Intermediate and to Holdings, respectively. Under the 2014 Revolver, Holdings may not make certain payments such as cash dividends, except that it may, inter alia, (i) pay up to $1 million per year to repurchase or redeem qualified equity interests of Holdings held by past or present officers, directors, or employees (or their estates) of the Company upon death, disability, or termination of employment, (ii) pay under its income tax receivable agreement (the “TRA”), and, (iii) so long as no default or event of default has occurred and is continuing, (a) make non-cash repurchases of equity interests in connection with the exercise of stock options by directors and officers, provided that those equity interests represent a portion of the consideration of the exercise price of those stock options, (b) pay up to $2.5 million per year pursuant to stock option plans, employment agreements, or incentive plans, (c) make up to $5 million in other restricted payments per year, and (d) make other restricted payments, provided that such payments would not cause, in each case, on a pro forma basis, (x) its lease-adjusted consolidated leverage ratio to equal or exceed 4.25 times and (y) its consolidated fixed charge coverage ratio to be less than 1.75 times. On July 14, 2014, we amended our certificate of incorporation to increase our authorized share count to 200,000,000 shares of common stock, par value $0.01 per share, and split our stock 8.56381:1. On July 24, 2014, we amended and restated our certificate of incorporation to, among other things, increase our authorized share count to 300,000,000 shares of stock, including 200,000,000 shares of common stock and 100,000,000 shares of preferred stock, each par value $0.01 per share. On July 30, 2014, we completed our initial public offering of 8,214,286 shares of common stock at a price to the public of $15.00 per share (the “IPO”), including 1,071,429 shares sold to the underwriters pursuant to their option to purchase additional shares. After underwriting discounts, commissions, and fees and expenses of IPO offering and distribution, as set forth in our registration statement for the IPO on Form S‑1, we received net IPO proceeds of approximately $112.3 million. We used these proceeds primarily to repay in whole a $100 million second lien term loan (the “Second Lien Term Loan”). All share and per-share data herein have been adjusted to reflect the 8.56381 for 1 common stock split effected on July 14, 2014 as though it had occurred prior to the earliest data presented.
Principles of Consolidation	Principles of Consolidation The accompanying condensed consolidated financial statements include the accounts of Holdings and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and revenue and expenses during the period reported. Actual results could materially differ from those estimates. The Company’s significant estimates include estimates for impairment of goodwill, intangible assets and property and equipment, insurance reserves, lease termination liabilities, closed store reserves, stock-based compensation, income tax receivable agreement liability, and income tax valuation allowances.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly-liquid instruments with a maturity of three months or less at the date of purchase to be cash equivalents.
Restricted Cash	Restricted Cash The Company’s restricted cash represents cash collateral to one commercial bank for Company credit cards.
Reclassifications	Reclassifications Certain comparative prior year amounts in the condensed consolidated financial statements and accompanying notes have been reclassified to conform to the current year presentation. These reclassifications have no effect on previously-reported working capital, net income, earnings per share, stockholders’ equity, or cash flows.
Liquidity Policy Text Block	Liquidity The Company’s principal liquidity requirements are to service our debt and to meet capital expenditure needs. At September 30, 2015, the Company’s total debt (including capital lease liabilities) was $125.7 million. The Company’s ability to make payments on its indebtedness and to fund planned capital expenditures depends on available cash and on its ability to generate adequate cash flows in the future, which, to a certain extent, is subject to general economic, financial, competitive, legislative, regulatory, and other factors that are beyond the Company’s control. Based on current operations, the Company believes that its cash flow from operations, available cash of $8.2 million at September 30, 2015, and available borrowings under the 2014 Revolver (which availability was approximately $68 million at September 30, 2015) will be adequate to meet the Company’s liquidity needs for the next 12 months.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In July 2015, the Financial Accounting Standard Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2015-11, "Simplifying the Measurement of Inventory."-ASU No. 2015-11 requires inventory that is recorded using the first-in, first-out method to be measured at the lower of cost or net realizable value. ASU No. 2015-11 will be effective retrospectively for the Company for the quarter ending December 31, 2017, with early adoption permitted. The adoption of this guidance is not expected to have a significant impact on the Company's consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. To simplify presentation of debt issuance costs, the standard requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs would not be affected by the amendments in this Update. ASU 2015-03 applies to all entities and is effective for annual reporting periods beginning after December 15, 2015, with early adoption permitted. The standard is to be applied retrospectively. The Company does not expect that the adoption of this standard will have a material effect on its consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers (Topic 606)." ASU No. 2014-09 clarifies the principles for recognizing revenue when an entity either enters into a contract with customers to transfer goods or services or enters into a contract for the transfer of non-financial assets. The original standard was effective retrospectively for the Company for the quarter ending December 31, 2017; however in July 2015, the FASB approved a one-year deferral of the standard. The new standard will become effective retrospectively for the Company for the quarter ending December 31, 2018, with early adoption permitted, but not before the original effective date. The Company does not expect that the adoption of this standard will have a material effect on its consolidated financial statements.
Subsequent Events	Subsequent Events Subsequent to September 30, 2015, the Company has completed four new store openings. Also subsequent to quarter end, the Company increased the letters of credit balance to $7.2M for changes in agreements with certain vendors. The Company evaluated subsequent events that have occurred after September 30, 2015, and determined that there were no other events or transactions occurring during this reporting period that require recognition or disclosure in the condensed consolidated financial statements.
Concentration of Risk	Concentration of Risk Cash and cash equivalents are maintained at financial institutions and, at times, balances may exceed federally-insured limits. The Company has never experienced any losses related to these balances. The Company had two suppliers for which amounts due at September 30, 2015 totaled 19% and 9% of the Company’s accounts payable. As of December 31, 2014, the Company had two different suppliers for which amounts totaled 6% and 5% of the Company’s accounts payable. For the thirteen weeks ended September 30, 2015 and September 24, 2014, purchases from the Company’s two largest suppliers totaled 37% and 2% and 36% and 3% of the Company’s purchases. For the thirty-nine weeks ended September 30, 2015 and September 24, 2014, purchases from the Company’s two largest suppliers totaled 37% and 3% and 36% and 3%, respectively, of the Company’s purchases. Company-operated and franchised restaurants in the greater Los Angeles area generated, in the aggregate, approximately 78% and 80% of total revenue for both the thirteen weeks ended September 30, 2015 and September 24, 2014.
Goodwill and Indefinite Lived Intangible Assets	Goodwill and Indefinite Lived Intangible Assets The Company’s indefinite lived intangible assets consist of trademarks. Goodwill represents the excess of cost over fair value of net identified assets acquired in business combinations accounted for under the purchase method. The Company does not amortize its goodwill and indefinite lived intangible assets. Goodwill resulted from historical acquisitions. Upon the sale of a restaurant, we decrement goodwill. The amount of goodwill included in the cost basis of the asset sold is determined based on the relative fair value of the portion of the reporting unit disposed compared to the fair value of the reporting unit retained. The Company performs annual impairment tests for goodwill during the fourth fiscal quarter of each year, or more frequently if impairment indicators arise. The Company reviews goodwill for impairment utilizing either a qualitative assessment or a two-step process. If the Company decides that it is appropriate to perform a qualitative assessment and concludes that the fair value of a reporting unit more likely than not exceeds its carrying value, no further evaluation is necessary. If the Company performs the two-step process, the first step of the goodwill impairment test is used to identify potential impairment by comparing the fair value of a reporting unit with its carrying amount, including goodwill. If the fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered not impaired and the second step of the impairment test is unnecessary. If the carrying amount of a reporting unit exceeds its fair value, the second step is performed to measure the amount of impairment by comparing the carrying amount of the goodwill to a determination of the implied value of the goodwill. If the carrying amount of goodwill is greater than the implied value, an impairment charge is recognized for the difference. The Company performs annual impairment tests for indefinite lived intangible assets during the fourth fiscal quarter of each year, or more frequently if impairment indicators arise. An impairment test consists of either a qualitative assessment or a comparison of the fair value of an intangible asset with its carrying amount. The excess of the carrying amount of an intangible asset over its fair value is its impairment loss. The assumptions used in the estimate of fair value are generally consistent with the past performance of the Company’s reporting segment and are also consistent with the projections and assumptions that are used in current operating plans. These assumptions are subject to change as a result of changing economic and competitive conditions. The Company did not identify any indicators of potential impairment during the thirteen and thirty-nine weeks ended September 30, 2015, and therefore did not perform any impairment review, nor did the Company record any impairment.
Income Taxes	Income Taxes The provision for income taxes, income taxes payable and deferred income taxes is determined using the asset and liability method. Deferred tax assets and liabilities are determined based on temporary differences between the financial carrying amounts and the tax bases of assets and liabilities using enacted tax rates in effect in the years in which the temporary differences are expected to reverse. On a periodic basis, the Company assesses the probability that its net deferred tax assets, if any, will be recovered. If, after evaluating all of the positive and negative evidence, a conclusion is made that it is more likely than not that some portion or all of the net deferred tax assets will not be recovered, a valuation allowance is provided by charging to tax expense to reserve the portion of deferred tax assets which are not expect to be realized. The Company reviews its filing positions for all open tax years in all U.S. federal and state jurisdictions where the Company is required to file. When there are uncertainties related to potential income tax benefits, in order to qualify for recognition, the position the Company takes has to have at least a “more likely than not” chance of being sustained (based on the position’s technical merits) upon challenge by the respective authorities. The term “more likely than not” means a likelihood of more than 50 percent. Otherwise, the Company may not recognize any of the potential tax benefit associated with the position. The Company recognizes a benefit for a tax position that meets the “more likely than not” criterion at the largest amount of tax benefit that is greater than 50 percent likely of being realized upon its effective resolution. Unrecognized tax benefits involve management’s judgment regarding the likelihood of the benefit being sustained. The final resolution of uncertain tax positions could result in adjustments to recorded amounts and may affect our results of operations, financial position, and cash flows. The Company’s policy is to recognize interest and penalties related to income tax matters in income tax expense. The Company had no accrual for interest or penalties at September 30, 2015, or at December 31, 2014, and did not recognize interest or penalties during the thirteen or thirty-nine weeks ended September 30, 2015, or September 24, 2014, since there were no material unrecognized tax benefits. Management believes no material changes to the amount of unrecognized tax benefits will occur within the next twelve months. On July 30, 2014, the Company entered into the TRA. The TRA calls for the Company to pay to its pre-IPO stockholders 85% of the savings in cash that the Company realizes in its taxes as a result of utilizing its net operating losses and other tax attributes attributable to preceding periods.