Goodwill and Other Intangible Assets - Intangible Assets, net (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 61,621	$ 61,621
Accumulated Amortization	(30,076)	(25,839)
Net	31,545	35,782
Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	59,410	59,410
Accumulated Amortization	(29,094)	(25,124)
Net	30,316	34,286
Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	2,211	2,211
Accumulated Amortization	(982)	(715)
Net	1,229	1,496
Customer relationships | Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	54,430	54,430
Accumulated Amortization	(25,584)	(21,938)
Net	28,846	32,492
Customer relationships | Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	2,089	2,089
Accumulated Amortization	(933)	(678)
Net	1,156	1,411
Trade names | Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	4,860	4,860
Accumulated Amortization	(3,473)	(3,161)
Net	1,387	1,699
Trade names | Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	122	122
Accumulated Amortization	(49)	(37)
Net	73	85
Non-compete agreement | Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	120	120
Accumulated Amortization	(37)	(25)
Net	$ 83	$ 95