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Acquisitions - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | ||||||||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Milbank
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Dec. 31, 2012
Milbank
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Mar. 31, 2012
Commodity Advisors
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Mar. 31, 2014
Commodity Advisors
Scenario, Forecast
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Dec. 31, 2013
Ten-Sixty
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Dec. 31, 2013
Ten-Sixty
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Mar. 28, 2013
Ten-Sixty
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Apr. 30, 2013
Ten-Sixty
Promissory Note
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Dec. 31, 2013
Ten-Sixty
Promissory Note
Installment
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Dec. 31, 2013
Ten-Sixty
Scenario, Forecast
Promissory Note
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| Business Acquisition [Line Items] | |||||||||||||||||||||
| Fair value adjustments on acquired assets | $ 148,000 | $ (42,000) | |||||||||||||||||||
| Liability for contingent consideration | 1,295,000 | 1,609,000 | |||||||||||||||||||
| Units issued for acquisition | 132,000 | ||||||||||||||||||||
| Value of future one-time earnout payment | 800,000 | ||||||||||||||||||||
| Redemption value of units issued | 400,000 | ||||||||||||||||||||
| Acquisition of assets | 1,900,000,000 | ||||||||||||||||||||
| Cash consideration under Asset Purchase Agreement | 2,500,000 | ||||||||||||||||||||
| Promissory note issued | 1,479,000 | ||||||||||||||||||||
| Number of installments | 2 | ||||||||||||||||||||
| Installment amount payable | 218,000 | 218,000 | |||||||||||||||||||
| Quarterly installments from June 30, 2014 through March 31, 2017 | 87,000 | ||||||||||||||||||||
| Interest on principal amount | 5.00% | ||||||||||||||||||||
| Costs related to acquisition | 51,000 | ||||||||||||||||||||
| Fair value of assets acquired | 0 | 0 | |||||||||||||||||||
| Revenue | 17,157,000 | 14,737,000 | 14,472,000 | 13,685,000 | 14,144,000 | 12,759,000 | 12,907,000 | 11,880,000 | 60,051,000 | 51,690,000 | 42,787,000 | 1,020,000 | |||||||||
| Net Income | $ 2,026,000 | $ 734,000 | $ 13,690,000 | $ 19,720,000 | $ 14,609,000 | $ 126,000 | |||||||||||||||