Segment Information - Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Total assets:
Total assets	$ 548,709	$ 538,457
Energy segment:
Total assets:
Total assets	247,780	244,164
Sports segment:
Total assets:
Total assets	18,718	20,495
Corporate and other business activities
Total assets:
Total assets	$ 282,211	$ 273,798