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Stock Split - Additional Information (Details) | 0 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 02, 2014 | Jan. 31, 2015 | Apr. 16, 2014 | Feb. 01, 2014
Class Of Stock [Line Items] |  |  |  |
Company stock split | 2.87 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |  |
Common stock, shares authorized | 110,000,000 us-gaap_CommonStockSharesAuthorized |  | 120,000,000 us-gaap_CommonStockSharesAuthorized |
Preferred stock, shares authorized |  | 20,000,000 us-gaap_PreferredStockSharesAuthorized |  | 0 us-gaap_PreferredStockSharesAuthorized
Common Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock, shares authorized | 100,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 100,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Preferred Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized |  |  | 20,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
Restricted Nonvoting Common Stock | Restricted Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock, shares authorized | 10,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember | 0 us-gaap_CommonStockSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember |  | 6,888,000 us-gaap_CommonStockSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember

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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 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 Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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