Revolving Credit Facilities (Details)		6 Months Ended
	Feb. 22, 2016	Jun. 30, 2017 USD ($)	Jul. 01, 2017
Line of Credit Facility [Line Items]
Maturity date		Sep. 25, 2019
Increase in aggregate commitment amount		$ 50,000,000
Required ratio of indebtedness to net capital		3.00
Required interest coverage ratio		5.00
Letters of credit to be drawn		$ 800,000
Eurodollar [Member] | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.25%
Eurodollar [Member] | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.50%
Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	110.00%
Base Rate [Member] | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.25%
Base Rate [Member] | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.50%
International [Member]
Line of Credit Facility [Line Items]
Revolving commitment amount		$ 5,000,000
Unused capacity		4,200,000
North America [Member]
Line of Credit Facility [Line Items]
Revolving commitment amount		175,000,000
Unused capacity		$ 54,800,000
Subsequent Event
Line of Credit Facility [Line Items]
Required ratio of indebtedness to net capital			3.00