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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	2.87us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Common stock, shares authorized	110,000,000us-gaap_CommonStockSharesAuthorized		120,000,000us-gaap_CommonStockSharesAuthorized
Preferred stock, shares authorized		20,000,000us-gaap_PreferredStockSharesAuthorized		0us-gaap_PreferredStockSharesAuthorized
Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	100,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		100,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares authorized			20,000,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Restricted Nonvoting Common Stock | Restricted Stock
Class Of Stock [Line Items]
Common stock, shares authorized	10,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember	0us-gaap_CommonStockSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember		6,888,000us-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)

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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)

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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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 4

-Subparagraph (SAB TOPIC 4.C)

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