Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands		9 Months Ended
	Oct. 01, 2015	Sep. 30, 2016
Goodwill
Goodwill impairment charge	$ 0
Minimum | Initial Costs For Transport Of Boxes [Member]
Goodwill
Finite-Lived Intangible Asset, Useful Life		1 year
Minimum | Customer Relationships Current Record Management Vendor Or Payments To Customers [Member]
Goodwill
Finite-Lived Intangible Asset, Useful Life		1 year
Minimum | Other Intangible Assets [Member]
Goodwill
Finite-Lived Intangible Asset, Useful Life		5 years
Minimum | Customer Relationships [Member]
Goodwill
Finite-Lived Intangible Asset, Useful Life		10 years
Maximum | Initial Costs For Transport Of Boxes [Member]
Goodwill
Finite-Lived Intangible Asset, Useful Life		30 years
Maximum | Customer Relationships Current Record Management Vendor Or Payments To Customers [Member]
Goodwill
Finite-Lived Intangible Asset, Useful Life		15 years
Maximum | Other Intangible Assets [Member]
Goodwill
Finite-Lived Intangible Asset, Useful Life		10 years
Maximum | Customer Relationships [Member]
Goodwill
Finite-Lived Intangible Asset, Useful Life		30 years