Significant Accounting Policies and Recently Issued Accounting Standards - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
ASU 2016-15 [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification from insurance proceeds on casualty disasters to accounts receivable in cash flow		$ 400,000
Pre Opening Inspections [Member]
Summary Of Significant Accounting Policies [Line Items]
Initial franchise fees	$ 2,500
Pre Opening Training Marketing [Member]
Summary Of Significant Accounting Policies [Line Items]
Initial franchise fees	$ 5,000
Franchise Agreements Prior to April 1, 2013 [Member]
Summary Of Significant Accounting Policies [Line Items]
Royalty fee	4.00%
Royalty fee rebate percentage	0.50%
Franchise Agreements on or after April 1, 2013 [Member]
Summary Of Significant Accounting Policies [Line Items]
Royalty fee	4.50%
Increase in royalty fee	0.50%
Royalty fee rebate percentage	0.50%
Franchise Agreements on or after April 1, 2013 [Member] | Non US [Member]
Summary Of Significant Accounting Policies [Line Items]
Royalty fee from new franchisees outside of the US	4.50%