Third Party Lease Commitments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Rent revenue	$ 3.8	$ 4.2	$ 3.8
Contingent rent revenue	0.4	0.4	0.3
Rent expense	6.1	5.2	3.7
Contingent rent expense	$ 0.7	$ 0.5	$ 0.1