Goodwill and Other Intangible Assets - Intangible Assets, net (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 61,621	$ 61,621
Accumulated Amortization	(28,001)	(25,839)
Net	33,620	35,782
Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	59,410	59,410
Accumulated Amortization	(27,153)	(25,124)
Net	32,257	34,286
Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	2,211	2,211
Accumulated Amortization	(848)	(715)
Net	1,363	1,496
Customer relationships \| Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	54,430	54,430
Accumulated Amortization	(23,805)	(21,938)
Net	30,625	32,492
Customer relationships \| Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	2,089	2,089
Accumulated Amortization	(805)	(678)
Net	1,284	1,411
Trade names \| Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	4,860	4,860
Accumulated Amortization	(3,317)	(3,161)
Net	1,543	1,699
Trade names \| Sports segment:
Finite-Lived Intangible Assets [Line Items]
Cost	122	122
Accumulated Amortization	(43)	(37)
Net	79	85
Non-compete agreement \| Energy segment:
Finite-Lived Intangible Assets [Line Items]
Cost	120	120
Accumulated Amortization	(31)	(25)
Net	$ 89	$ 95

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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