Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended		9 Months Ended							9 Months Ended	12 Months Ended	0 Months Ended				3 Months Ended		9 Months Ended			0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended		0 Months Ended				0 Months Ended
	Jul. 30, 2014	Jul. 14, 2014	Sep. 24, 2014	Sep. 25, 2013	Sep. 24, 2014 Segment	Sep. 25, 2013	Jul. 30, 2014	Jul. 24, 2014	Jul. 14, 2014	Dec. 25, 2013	Dec. 26, 2012	Sep. 24, 2014 Supplier Concentration Risk [Member] Supplier	Dec. 25, 2013 Supplier Concentration Risk [Member] Supplier	Sep. 24, 2014 Supplier One [Member] Accounts Payable [Member] Supplier Concentration Risk [Member]	Dec. 25, 2013 Supplier One [Member] Accounts Payable [Member] Supplier Concentration Risk [Member]	Sep. 24, 2014 Supplier Two [Member] Accounts Payable [Member] Supplier Concentration Risk [Member]	Dec. 25, 2013 Supplier Two [Member] Accounts Payable [Member] Supplier Concentration Risk [Member]	Sep. 24, 2014 Los Angeles [Member] Revenue [Member] Geographic Concentration Risk [Member]	Sep. 25, 2013 Los Angeles [Member] Revenue [Member] Geographic Concentration Risk [Member]	Sep. 24, 2014 Los Angeles [Member] Revenue [Member] Geographic Concentration Risk [Member]	Sep. 25, 2013 Los Angeles [Member] Revenue [Member] Geographic Concentration Risk [Member]	Sep. 24, 2014 First Lien Credit Agreement [Member] Senior Secured Revolving Credit Facility [Member]	Jul. 30, 2014 Over-Allotment Option [Member]	Sep. 24, 2014 AA Pollo, Inc. [Member] Restaurants	Jul. 11, 2014 Trimaran Fund Management, LLC [Member] Franchise Development Agreement [Member]	Sep. 24, 2014 Trimaran Fund Management, LLC [Member] Franchise Development Agreement [Member]	Jul. 11, 2014 Trimaran Fund Management, LLC [Member] Initial Option [Member]	Jul. 11, 2014 Trimaran Fund Management, LLC [Member] Initial Option [Member] Restaurants	Jul. 11, 2014 Trimaran Fund Management, LLC [Member] Additional Option [Member]	Jul. 11, 2014 Trimaran Fund Management, LLC [Member] Additional Option [Member] Restaurants	Sep. 24, 2014 San Antonio Area [Member] AA Pollo, Inc. [Member] Franchise Development Agreement [Member] Restaurants	Sep. 24, 2014 Houston Area [Member] AA Pollo, Inc. [Member] Franchise Development Agreement [Member] Restaurants	Jul. 30, 2014 Maximum [Member] First Lien Credit Agreement [Member]	Jul. 30, 2014 Second Lien Term Loan [Member]	Sep. 24, 2014 Entity Operated Units [Member] Restaurants	Sep. 24, 2014 Franchised Units [Member] Restaurants
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants																												15		100	8	12			166	239
Number of operating segments					1
Common stock, shares authorized			200,000,000		200,000,000			200,000,000	200,000,000	200,000,000
Common stock, par value			$ 0.01		$ 0.01			$ 0.01	$ 0.01	$ 0.01
Stock split ratio		8.56381
Shares of stock authorized								300,000,000
Preferred stock, shares authorized			100,000,000		100,000,000			100,000,000		100,000,000
Preferred stock, par value			$ 0.01		$ 0.01			$ 0.01		$ 0.01
Common stock issued under IPO	8,214,286																						1,071,429
Common stock sale price, per share							$ 15.00
Proceeds from issuance initial public offering	$ 112,300,000
Payment of second lien term loan																																		100,000,000
Stock split effective date	Jul. 14, 2014
Total amount of outstanding debt			188,700,000		188,700,000
Cash available			41,825,000	22,418,000	41,825,000	22,418,000				17,015,000	21,487,000
Revolving line of credit																						15,000,000
Amount of borrowings available																						7,700,000
Number of suppliers												2	2
Percentage of accounts payable or revenue														43.00%	45.00%	11.00%	11.00%	79.00%	80.00%	80.00%	80.00%
Number of restaurants sold																								6
Cash proceeds from sale of restaurants					5,435,000	15,000
Goodwill					(650,000)
Gain on sale of restaurant			2,658,000		2,658,000
Valuation allowance released			65,000,000
Additional deferred tax asset and tax benefit			5,400,000
Unrecognized tax benefits, accrual of interest or penalties			0		0					0
Unrecognized tax benefits, interest or penalties expenses			0	0	0	0
Percentage of cash savings in taxes realized as a result of utilizing net operating losses payable to pre-IPO stockholders	85.00%
Dividends receivable from subsidiaries per fiscal year																																	11,000,000
Total dividends receivable from subsidiaries																																	33,000,000
Charge relating to present value of total expected TRA payments			$ 40,119,000		$ 40,119,000
Number of years available under plan																											5 years		10 years
Related party agreement, termination period																									10 years
Related party agreement, termination description																										The Franchise Development Option Agreement terminates (i) ten years after execution, or (ii) if the Initial Option is exercised, five years after that exercise.