Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Derivative Assets	$ 617	$ 337
Total assets	20,216	17,117
Liabilities:
Derivative Liabilities	1,076	2,478
Total liabilities	1,076	2,478
Quoted Prices in Active Markets For Identical Assets Level 1 [Member]
Assets:
Total assets	19,599	16,780
Liabilities:
Total liabilities	0	0
Significant Other Observable Inputs Level 2 [Member]
Assets:
Total assets	617	337
Liabilities:
Total liabilities	1,076	2,478
Significant Unobservable Inputs Level 3 [Member]
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Equity Investments Held in Rabbi Trust for the Deferred Compensation Plan [Member] \| Other Current Assets [Member]
Assets:
Investments held in rabbi trust for the Deferred Compensation Plan	14,357	11,263
Equity Investments Held in Rabbi Trust for the Deferred Compensation Plan [Member] \| Other Current Assets [Member] \| Quoted Prices in Active Markets For Identical Assets Level 1 [Member]
Assets:
Investments held in rabbi trust for the Deferred Compensation Plan	14,357	11,263
Equity Investments Held in Rabbi Trust for the Deferred Compensation Plan [Member] \| Other Current Assets [Member] \| Significant Other Observable Inputs Level 2 [Member]
Assets:
Investments held in rabbi trust for the Deferred Compensation Plan	0	0
Equity Investments Held in Rabbi Trust for the Deferred Compensation Plan [Member] \| Other Current Assets [Member] \| Significant Unobservable Inputs Level 3 [Member]
Assets:
Investments held in rabbi trust for the Deferred Compensation Plan	0	0
Debt Investments Held in Rabbi Trust for the Deferred Compensation Plan [Member] \| Other Current Assets [Member]
Assets:
Investments held in rabbi trust for the Deferred Compensation Plan	5,242	5,517
Debt Investments Held in Rabbi Trust for the Deferred Compensation Plan [Member] \| Other Current Assets [Member] \| Quoted Prices in Active Markets For Identical Assets Level 1 [Member]
Assets:
Investments held in rabbi trust for the Deferred Compensation Plan	5,242	5,517
Debt Investments Held in Rabbi Trust for the Deferred Compensation Plan [Member] \| Other Current Assets [Member] \| Significant Other Observable Inputs Level 2 [Member]
Assets:
Investments held in rabbi trust for the Deferred Compensation Plan	0	0
Debt Investments Held in Rabbi Trust for the Deferred Compensation Plan [Member] \| Other Current Assets [Member] \| Significant Unobservable Inputs Level 3 [Member]
Assets:
Investments held in rabbi trust for the Deferred Compensation Plan	0	0
Foreign Currency Contracts [Member]
Assets:
Derivative Assets	617	337
Liabilities:
Derivative Liabilities	1,076	2,478
Foreign Currency Contracts [Member] \| Quoted Prices in Active Markets For Identical Assets Level 1 [Member]
Assets:
Derivative Assets	0	0
Liabilities:
Derivative Liabilities	0	0
Foreign Currency Contracts [Member] \| Significant Other Observable Inputs Level 2 [Member]
Assets:
Derivative Assets	617	337
Liabilities:
Derivative Liabilities	1,076	2,478
Foreign Currency Contracts [Member] \| Significant Unobservable Inputs Level 3 [Member]
Assets:
Derivative Assets	0	0
Liabilities:
Derivative Liabilities	$ 0	$ 0

SYKES ENTERPRISES INC 10-Q