Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified			0 Months Ended			0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Aug. 13, 2014 Subsequent Event [Member] Ryerson Holding [Member] Initial Public Offering [Member]	Jul. 23, 2014 Subsequent Event [Member] Ryerson Holding [Member] Initial Public Offering [Member]	Aug. 13, 2014 Subsequent Event [Member] Ryerson Holding [Member] Initial Public Offering [Member] Ryerson Credit Facility [Member]	Aug. 13, 2014 Subsequent Event [Member] Ryerson Holding [Member] Initial Public Offering [Member] 2018 Notes [Member]
Subsequent Event [Line Items]
Agreement Termination Advisory fee			$ 25.0	$ 25.0
Common stock shares, issued	100	100	11,000,000
Common stock, per share	$ 0.01	$ 0.01	$ 11
Net Proceeds from initial public offering			110.7
Aggregate principal amount of 2018 notes			99.5			99.5
Payments related to transaction fees, expenses and premiums on offering			15.7
Additional amount borrowed					29.5
Redemption premium						11.2
Debt issuance costs associated with partial redemption						1.2
Compensation expense			$ 7.3