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Deferred Costs - Summary of Deferred Costs and Amortization of Deferred Costs (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Deferred Costs [Abstract] |  |
Balances, at beginning of period | $ 39,933 | $ 32,117
Incurred deferred costs | 49,583 | 44,628
Amortized deferred costs | (44,041) | (36,812)
Balances, at end of period | $ 45,475 | $ 39,933

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- Definition Deferred cost amortized set up fees. + References No definition available. + Details
Name: | spsc_DeferredCostAmortizedSetUpFees
Namespace Prefix: | spsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred cost incurred set up fees. + References No definition available. + Details
Name: | spsc_DeferredCostIncurredSetUpFees
Namespace Prefix: | spsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DeferredCostsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying amount of deferred costs. + References No definition available. + Details
Name: | us-gaap_DeferredCostsCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant