Significant Accounting Policies - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Customer	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Customer	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Significant Accounting Policies [Line Items]
Subordinated note outstanding	$ 2,500,000		$ 2,500,000		$ 2,500,000
Maximum life of current operating leases			expire at various dates through 2024
Capital leases	4,700,000		$ 4,700,000		4,800,000
Accumulated amortization	3,600,000		3,600,000		$ 4,000,000
Depreciation and amortization	$ 3,309,000	$ 2,878,000	6,564,000	$ 5,768,000
Payments for interest			300,000	300,000
Income taxes			700,000	400,000
Assets Held Under Capital Leases
Significant Accounting Policies [Line Items]
Depreciation and amortization			$ 1,000,000	$ 1,200,000
Sales Revenue, Services, Net
Significant Accounting Policies [Line Items]
Number of customers representing more than 10% | Customer	1		1
Credit Concentration Risk | Sales Revenue, Services, Net
Significant Accounting Policies [Line Items]
Concentration risk percentage			14.00%
Maximum
Significant Accounting Policies [Line Items]
Debt instrument covenant subordinated debt limit	$ 5,000,000		$ 5,000,000
Minimum
Significant Accounting Policies [Line Items]
Subordinated note outstanding	$ 2,500,000		$ 2,500,000