Acquisitions - Narrative (Details) $ in Thousands	6 Months Ended	7 Months Ended
	Jun. 30, 2017 USD ($) Entity	Dec. 31, 2016 USD ($) Entity
Acquisitions
Goodwill	$ 176,231	$ 169,940
Fiscal 2017 Acquisitions
Acquisitions
Number of acquisitions | Entity	1
Cash paid for acquisition	$ 4,500
Contingent consideration	2,508
Goodwill	3,326
Other intangible assets	2,742
Revenues	2,000
Operating income	$ 200
Fiscal 2017 Acquisitions | U.S.
Acquisitions
Number of acquisitions | Entity	1
Cash paid for acquisition	$ 4,500
Contingent consideration	$ 3,500
Initial period over which potential acquisition-related contingent consideration would be payable	3 years
Goodwill	$ 3,300
Fiscal 2017 Acquisitions | U.S. | Customer Relationships and Covenants Not To Compete
Acquisitions
Other intangible assets	$ 2,700
Fiscal 2016 Acquisitions
Acquisitions
Number of acquisitions | Entity		1
Goodwill		$ 2,900
Other intangible assets		$ 3,200