Fair Value - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable		$ 46,000
Note receivable, interest rate	10.00%
Accounts receivable, long-term	1,410,000	1,410,000
Carrying (reported) amount, fair value disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	12,600,000	9,700,000
Estimate of fair value, fair value disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	0	13,000,000
West Construction, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of earnout		$ 271,000