Acquisitions (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability	$ 1,420		$ 9,124	$ 3,000
Payments to Acquire Businesses, Net of Cash Acquired	0	$ 36,753
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	$ 298	$ (1,425)
Greats Brand Inc. [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Business Acquisition, Percentage of Voting Interests Acquired			90.00%
Payments to Acquire Businesses, Gross			$ 12,829
Business Combination, Contingent Consideration, Liability	$ 670
Payments to Acquire Businesses, Net of Cash Acquired			14,209
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			290
Business Combination, Acquired Receivable, Fair Value			41
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory			1,387
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets			6,447
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable			(1,963)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities			(1,055)
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			(1,611)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			14,499
shoo:FutureContingentPayment			5,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities			$ (3,463)
B. B. Dakota, Inc. [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Payments to Acquire Businesses, Gross			$ 24,568
Business Combination, Contingent Consideration, Liability	$ 750		4,770
Payments to Acquire Businesses, Net of Cash Acquired			29,404
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			353
Business Combination, Acquired Receivable, Fair Value			4,419
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory			6,696
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets			855
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			382
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable			(2,885)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities			(2,893)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			16,392
Goodwill – net			13,365
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			29,757
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities			(2,735)
Customer Relationships [Member] | Greats Brand Inc. [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired			1,140
Customer Relationships [Member] | B. B. Dakota, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired			2,530
Trademarks [Member] | Greats Brand Inc. [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired			13,086
Trademarks [Member] | B. B. Dakota, Inc. [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired			$ 9,670