Amount of allowance for credit loss on noncurrent accounts receivable.

No definition available.

Name:	syke_AllowanceForDoubtfulNoncurrentAccountsReceivable
Namespace Prefix:	syke_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase (decrease) in allowance for credit loss on noncurrent accounts receivable.

+ References

No definition available.

+ Details

Name:	syke_AllowanceForDoubtfulNoncurrentAccountsReceivablePeriodIncreaseDecrease
Namespace Prefix:	syke_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Organization consolidation and presentation of financial statements.

+ References

No definition available.

+ Details

Name:	syke_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems
Namespace Prefix:	syke_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Indicates (true false) whether accounting standards update was adopted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

+ Details

Name:	us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdopted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	instant

- Definition

Date accounting standards update was adopted, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794

+ Details

Name:	us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdoptionDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

- Definition

Indicates transition method applied for adoption of accounting standards update. Acceptable values are "Retrospective", "Prospective", "Modified Retrospective" and "Modified Prospective".

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

+ Details

Name:	us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateTransitionOptionElectedFixedList
Namespace Prefix:	us-gaap_
Data Type:	us-types:transitionOptionType
Balance Type:	na
Period Type:	instant

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

No definition available.

+ Details

Name:	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

Name:	us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=syke_AccountingStandardsUpdate201904Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201813Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201815Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Overview and Basis of Presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020 USD ($) Segment	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of reportable segments \| Segment	2
Accounts Receivable, Credit Loss Expense (Reversal)	$ 600,000
Accounts Receivable, Allowance for Credit Loss, Writeoff	300,000
Noncurrent Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	0
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Noncurrent Accounts Receivable, Allowance for Credit Loss	$ 100,000		$ 100,000
Accounting Standards Update 2016-13 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
ASU adoption status		true
ASU adoption approach		Modified Retrospective
Accounting Standards Update 2016-13 [Member] \| Retained Earnings [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Cumulative effect of accounting change		$ 0
Accounting Standards Update 2019-04 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
ASU adoption status		true
ASU adoption date		Jan. 01, 2020
Accounting Standards Update 2018-13 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
ASU adoption status	true
ASU adoption date	Jan. 01, 2020
Accounting Standards Update 2018-15 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
ASU adoption status	true
ASU adoption approach	Prospective
ASU adoption date	Jan. 01, 2020