Fair Value Measurements Carrying Value and Fair Value of Long-Term Debt and Other Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrants, Carrying Value	$ 17,145		$ 12,123
Common stock warrants, Fair Value	17,145	[1]	12,123	[1]
Contingent consideration liability, Carrying Value	14,060		9,131
Contingent consideration liability, Fair Value	14,060	[1]	9,131	[1]
Long term debt fair value	11.75%		14.11%
Retail Credit Agreement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of credit, Carrying Value	22,100	[2]	22,750	[2]
Lines of credit, Fair Value	22,100	[1],[2]	22,750	[1],[2]
Texadian Uncommitted Credit Agreement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of credit, Carrying Value	0		26,500
Lines of credit, Fair Value	0	[1]	26,500	[1]
Tranche B Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of credit, Carrying Value	90,399		87,360
Lines of credit, Fair Value	$ 92,356	[1]	$ 87,068	[1]

[1] The fair values of these instruments are considered Level 3 measurements in the fair value hierarchy.

[2] Fair value approximates carrying value due to the floating rate interest.