| 
           Acquisition of Red Robin Franchised Restaurants (Details) (USD $) 
         | 
        0 Months Ended | 6 Months Ended | 0 Months Ended | 0 Months Ended | 0 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 
           Jul. 13, 2014 
         | 
        
           Dec. 29, 2013 
         | 
        
           Mar. 24, 2014
 
          March 2014, acquisition of four franchise restaurants
 
          franchisee
 
          restaurant 
         | 
        
           Jul. 13, 2014
 
          March 2014, acquisition of four franchise restaurants 
         | 
        
           Mar. 24, 2014
 
          March 2014, acquisition of four franchise restaurants
 
          restaurant 
         | 
        
           Mar. 24, 2014
 
          Franchise rights
 
          March 2014, acquisition of four franchise restaurants 
         | 
        
           Mar. 24, 2014
 
          Franchise rights
 
          March 2014, acquisition of four franchise restaurants 
         | 
        
           Mar. 24, 2014
 
          Leasehold interests
 
          March 2014, acquisition of four franchise restaurants 
         | 
        
           Mar. 24, 2014
 
          Leasehold interests
 
          March 2014, acquisition of four franchise restaurants 
         | 
        
           Mar. 24, 2014
 
          Unfavorable leases
 
          March 2014, acquisition of four franchise restaurants 
         | 
      |
| Business Acquisition [Line Items] | ||||||||||
| Number of restaurants acquired from franchisees | 4 | |||||||||
| Number of franchisees | 1 | |||||||||
| Purchase price, cash | $ 7,900,000 | |||||||||
| Acquisition costs incurred | 200,000 | |||||||||
| Amortization period of intangible assets | 14 years | 9 years | 14 years | |||||||
| Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] | ||||||||||
| Property, plant and equipment | 3,785,000 | |||||||||
| Intangible assets | 3,092,000 | 2,600,000 | 500,000 | |||||||
| Goodwill | 64,647,000 | 62,525,000 | 2,122,000 | |||||||
| Other current and non-current assets | 261,000 | |||||||||
| Gift card liabilities | (59,000) | |||||||||
| Unfavorable leases | (1,256,000) | |||||||||
| Total purchase price | $ 7,945,000 |