Fair Value Measurement - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2015	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	$ 0		$ 0		$ 500,000
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges			0	$ 0
Interest rate swap | Cash flow hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ineffective portion of cash flow hedges recognized			0	$ 0
Contingent consideration receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consideration in contingent nature (as a percent)		40.00%
Contingent consideration receivable | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Period of contingent consideration receivable		18 months
Contingent consideration receivable | Recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	0		0
Security business | Disposed of by sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total earn out of contingent consideration	600,000
Additional earn out of contingent consideration	$ 100,000		$ 100,000
Fair value of contingent consideration receivable		$ 500,000			$ 500,000