Exit Activity Costs and Asset Impairments (Narrative) (Details) (USD $)	3 Months Ended
Mar. 31, 2015 product_line facility	Mar. 31, 2014
Restructuring and Related Activities [Abstract]
Number of facilities sold	1rock_NumberOfFacilitiesSold
Number of product lines eliminated	1rock_NumberOfProductLinesEliminated
Asset impairment charges related to facility consolidations	$ 6,691,000us-gaap_AssetImpairmentCharges	$ 83,000us-gaap_AssetImpairmentCharges

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration