Fair Value - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2013	Jun. 30, 2013 Carrying (reported) amount, fair value disclosure	Jun. 30, 2013 Estimate of fair value, fair value disclosure	Dec. 31, 2012 Estimate of fair value, fair value disclosure	Jun. 30, 2013 West Construction, Inc.	Mar. 31, 2013 West Construction, Inc.	Jun. 30, 2013 Secured Debt Carrying (reported) amount, fair value disclosure
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
Fair value of earnout						0	271,000
Fair value of debt			$ 12,600,000	$ 13,000,000	$ 0			$ 9,300,000