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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 252 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2014 | Jul. 31, 2013 | Feb. 28, 2013 | Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 item | Feb. 28, 2015 | May 16, 2012
Common Stock |  |  |  |  |  |  |  |  |
Number of common stock share authorized before amendment to Restated Articles of Incorporation |  |  |  |  |  |  |  |  | 100,000,000 rs_CommonStockShareAuthorizedBeforeAmendment
Number of common stock shares authorized |  |  |  | 200,000,000 us-gaap_CommonStockSharesAuthorized | 200,000,000 us-gaap_CommonStockSharesAuthorized |  | 200,000,000 us-gaap_CommonStockSharesAuthorized |  | 200,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |
Votes per share of common stock |  |  |  | 1 rs_CommonStockNumberOfVotingRightsPerShare |  |  | 1 rs_CommonStockNumberOfVotingRightsPerShare |  |
Common stock quarterly dividend per share, after increase (in dollars per share) | $ 0.35 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.33 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.30 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.40 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.26 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.80 us-gaap_CommonStockDividendsPerShareDeclared |  |  |
Common stock quarterly dividend per share, before increase (in dollars per share) |  |  | $ 0.25 rs_CommonStockDividendsPerShareDeclaredBeforeIncrease |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |  |
Number of shares repurchased under stock repurchase plan |  |  |  | 759,800 us-gaap_TreasuryStockSharesAcquired |  |  | 16,000,000 us-gaap_TreasuryStockSharesAcquired |  |
Average costs per share |  |  |  | $ 65.80 rs_StockRepurchaseAcquiredAverageCostPerShare |  |  | $ 20.66 rs_StockRepurchaseAcquiredAverageCostPerShare |  |
Value of shares repurchased |  |  |  | $ 50.0 us-gaap_StockRepurchasedDuringPeriodValue |  |  |  |  |
Number of shares authorized by the Board of Directors to be repurchased under stock repurchase plan |  |  |  | 7,123,233 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  | 7,123,233 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |
Preferred Stock |  |  |  |  |  |  |  |  |
Preferred stock, authorized shares |  |  |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |
Minimum number of series in which preferred shares may be issued |  |  |  | 1 rs_PreferredStockSharesIssuanceNumberOfSeriesMinimum |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Common stock quarterly dividend per share, after increase (in dollars per share) |  |  |  |  |  |  |  | $ 0.40 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding, before increase. + References No definition available. + Details
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- Definition The number of votes per share of common stock on all matters except the election of members to the Board of Directors. + References No definition available. + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws, before amendment. + References No definition available. + Details
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- Definition Represents the minimum number of series in which preferred shares may be issued. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. This element is used when state law does not recognize treasury stock. + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Face amount per share of no-par value common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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