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Revenue - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |
Earliest timing of billings | in advance
Latest timing of billings | 30 days
Estimated period for material rights present to customers | 2 years
Set up fees recognized period | 2 years
Maximum recognition period for miscellaneous one-time fee | 1 year
Analytics Solution [Member] |
Disaggregation Of Revenue [Line Items] |
Set up fees recognized period | 1 year
Minimum [Member] |
Disaggregation Of Revenue [Line Items] |
Customer contract cancellation period | 30 days
Current amount recognition period of set up fees | 1 month
Long term amount recognition period of set up fees | 13 months
Maximum [Member] |
Disaggregation Of Revenue [Line Items] |
Customer contract cancellation period | 90 days
Deferred revenue recognition period | 1 year
Contract period for remaining performance obligations for contracts in which the optional exemption under ASC 606-10-50-14(a) was applied | 1 year
Current amount recognition period of set up fees | 12 months
Long term amount recognition period of set up fees | 24 months

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- Definition Current amount recognition period of set up fees. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Customer contract cancellation period. + References No definition available. + Details
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Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Deferred revenue recognition period. + References No definition available. + Details
Name: | spsc_DeferredRevenueRecognitionPeriod
Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated period for material rights present to customers. + References No definition available. + Details
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Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Long term amount recognition period of set up fees. + References No definition available. + Details
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Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum recognition period for miscellaneous one-time fee. + References No definition available. + Details
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Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Recurring revenues timing of billings earliest period description. + References No definition available. + Details
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Namespace Prefix: | spsc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Recurring revenues timing of billings latest period. + References No definition available. + Details
Name: | spsc_RecurringRevenuesTimingOfBillingsLatestPeriod
Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contract period for remaining performance obligations for contracts in which the optional exemption under ASC 606-10-50-14(a) was applied. + References No definition available. + Details
Name: | spsc_RevenueRemainingPerformanceObligationForContractsOriginalDurations
Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Set up fees recognized period. + References No definition available. + Details
Name: | spsc_SetUpFeesRecognizedPeriod
Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |