Segment Information - Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Total assets:
Total assets	$ 439,105	$ 479,354
Sports segment:
Total assets:
Total assets	14,970	18,625
Energy segment:
Total assets:
Total assets	208,118	220,262
Corporate and other business activities
Total assets:
Total assets	$ 216,017	$ 240,467