Fair Value Measurement - Assets and Liabilities Measured on Recurring Basis (Details) - Recurring basis - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Level 1
Assets
Assets, fair value	$ 0	$ 0
Level 1 | Prepaid expenses and other | Interest rate swap
Assets
Assets, fair value	0	0
Level 1 | Prepaid expenses and other | Contingent consideration receivable
Assets
Assets, fair value	0	0
Level 2
Assets
Assets, fair value	0	100,000
Level 2 | Prepaid expenses and other | Interest rate swap
Assets
Assets, fair value	0	100,000
Level 2 | Prepaid expenses and other | Contingent consideration receivable
Assets
Assets, fair value	0	0
Level 3
Assets
Assets, fair value	0	500,000
Level 3 | Contingent consideration receivable
Assets
Assets, fair value	0
Level 3 | Prepaid expenses and other | Interest rate swap
Assets
Assets, fair value	0	0
Level 3 | Prepaid expenses and other | Contingent consideration receivable
Assets
Assets, fair value	$ 0	$ 500,000