Segment Information - Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Total assets:
Total assets	$ 574,504	$ 538,706
Sports segment:
Total assets:
Total assets	20,861	20,495
Energy segment:
Total assets:
Total assets	251,848	244,413
Corporate and other business activities
Total assets:
Total assets	$ 301,795	$ 273,798