Impairment Losses - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Marketing & Events Group [Member]	Aug. 31, 2013 Glacier Park [Member]	Sep. 30, 2013 Glacier Park [Member]	Aug. 31, 2013 Glacier Park [Member] Noncontrolling Interest [Member]	Sep. 30, 2013 Glacier Park [Member] Noncontrolling Interest [Member]
Schedule Of Asset Impairment Charges [Line Items]
Non-cash impairment charge	$ 4,461,000		$ 4,461,000			$ 4,461,000	$ 4,461,000		$ 892,000
Goodwill impairment loss related to noncontrolling interest								892,000
Impairment charges			$ 5,413,000		$ 952,000