Goodwill and Other Intangible Assets - Intangible Assets, net (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Cost	$ 61,155	$ 60,645
Accumulated Amortization	(18,898)	(16,257)
Net	42,257	44,388
Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	59,360	59,360
Accumulated Amortization	(18,561)	(16,015)
Net	40,799	43,345
Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	1,795	1,285
Accumulated Amortization	(337)	(242)
Net	1,458	1,043
Customer relationships | Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	54,380	54,380
Accumulated Amortization	(15,970)	(13,700)
Net	38,410	40,680
Customer relationships | Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	1,673	1,163
Accumulated Amortization	(318)	(230)
Net	1,355	933
Trade names | Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	4,860	4,860
Accumulated Amortization	(2,584)	(2,315)
Net	2,276	2,545
Trade names | Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	122	122
Accumulated Amortization	(19)	(12)
Net	103	110
Non-compete agreement | Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	120	120
Accumulated Amortization	(7)	0
Net	$ 113	$ 120