Segment Information - Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Total assets:
Total assets	$ 552,009	$ 538,694
Sports segment:
Total assets:
Total assets	19,344	20,495
Energy segment:
Total assets:
Total assets	256,416	244,401
Corporate and other business activities
Total assets:
Total assets	$ 276,249	$ 273,798