Leases - Additional Information (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) lease	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Leases [Abstract]
Letters of credit outstanding, amount related to leases	$ 1,136,000
Leases expiring with no renewal options, next 5 years | lease	20
Leases expiring with no renewal options, current year | lease	3
Leases expiring with renewal options, next 5 years | lease	53
Rent expense excluding deferred lease liabilities	$ 124,920,000	$ 124,816,000	$ 118,811,000
Non-base rent expense	24,767,000	24,340,000	23,539,000
Rent expense	123,872,000	124,449,000	117,191
Rental income	4,669,000	4,791,000	5,161,000
Rental income above base rent	0	229,000	242,000
Rental income from owned property	$ 1,926,000	$ 2,000,000	2,000,000
Non cash rental income revenue out of period adjustment			$ 424,000