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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 25, 2015
USD ($)
Mar. 31, 2010
USD ($)
Job
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Other Commitments [Line Items]              
Payments for legal settlements $ 20,000            
Logo change agreement period 60 days            
Liability for deferred rent     $ 800,000   $ 800,000   $ 800,000
Operating lease rent expense     $ 1,100,000 $ 1,000,000 $ 3,300,000 $ 2,400,000  
Minimum [Member]              
Other Commitments [Line Items]              
Operating lease expiration year         2015    
Maximum [Member]              
Other Commitments [Line Items]              
Operating lease expiration year         2021    
Oklahoma City Economic Development Trust [Member]              
Other Commitments [Line Items]              
Up-front job creation payment from Trust   $ 2,000,000          
Term of agreement   5 years          
Oklahoma City Economic Development Trust [Member] | Minimum [Member]              
Other Commitments [Line Items]              
Number of jobs created within a 5 year period | Job   492          
Average first year wage   $ 37,000          
Capital investment in the project   $ 15,000,000