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Equity Method Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 11, 2014
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 124.9us-gaap_EquityMethodInvestments	$ 102.0us-gaap_EquityMethodInvestments
Joint-venture interest				100.00%
Contingent rent expense	8.0	4.9	9.3
Tim Hortons [Member]
Schedule of Equity Method Investments [Line Items]
Joint-venture interest	50.00%
Distributions of joint venture	3.9
Contingent rent expense	1.0
Carrols Restaurant Group, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Quoted market price	71.8
Carrols Restaurant Group, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Noncash dilution gain on the issuance of stock	5.8
Ownership interest in equity method investee before additional common stock issued	29.00%
Ownership interest in equity method investee after additional common stock issued	21.00%
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Accounts receivable from equity method investments	$ 22.6	$ 18.1