Equity (Details 7) (Employee Stock Purchase Plan (ESPP))	12 Months Ended
Dec. 31, 2010 H	Dec. 31, 2013
Employee Stock Purchase Plan (ESPP)
Share-Based Compensation
Shares right to subscribe	2,000,000
Minimum number of hours per week required to participate in ESPP	20
Minimum number of months of employment per calendar year to participate in ESPP	5 months
Maximum employee stock ownership percentage	5.00%
Purchase price as a percentage of market value of the common stock	85.00%
Share available for future offerings		600,000

Represents the maximum stock ownership percentage for an employee to be eligible to participate in the ESPP.

No definition available.

Name:	dst_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardMaximumOwnershipPercentage
Namespace Prefix:	dst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the minimum number of hours per week an employee must work each to participate in the ESPP.

+ References

No definition available.

+ Details

Name:	dst_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardRequisiteServicePeriodESPPMinimumHoursPerWeek
Namespace Prefix:	dst_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum number of months an employee must work each calendar year to participate in the ESPP.

+ References

No definition available.

+ Details

Name:	dst_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardRequisiteServicePeriodESPPMinimumMonthsPerCalendarYear
Namespace Prefix:	dst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration