Subsequent Events (Details)		6 Months Ended
	Aug. 05, 2015 USD ($) employee	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity		$ 11,400,000
Payment of debt		$ 4,541,000	$ 389,000
Subsequent Event
Subsequent Event [Line Items]
Payment of debt	$ 32,700,000
Subsequent Event | Line of Credit
Subsequent Event [Line Items]
Debt instrument, term	5 years
Line of credit facility, maximum borrowing capacity	$ 185,000,000
Long-term Line of Credit	149,000,000
Line of credit facility, remaining borrowing capacity	36,000,000
Subsequent Event | Line of Credit | Term Loan
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	135,000,000
Subsequent Event | Line of Credit | Revolving Credit Facility
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	50,000,000
Line of credit facility, accordion feature, increase limit	40,000,000
Subsequent Event | TAS Commercial Concrete
Subsequent Event [Line Items]
Payments to acquire businesses	$ 115,000,000
Number of employees (employees) | employee	1,200