Annual report pursuant to Section 13 and 15(d)

The Company and Summary of Significant Accounting Policies - Additional Information (Detail)

v3.10.0.1
The Company and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Store
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]        
Derivative effective dates   Aug. 12, 2015    
Impairment charges   $ 0 $ 0 $ 0
Advertising expense   278,400,000 260,400,000 213,100,000
Prepaid advertising costs   4,400,000 8,600,000  
Product design and development costs   18,500,000 18,800,000 13,600,000
Warehouse and distribution costs   249,600,000 219,600,000 $ 187,300,000
Sales Returns and Allowances [Member]        
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]        
Sales returns liability   $ 67,300,000 $ 43,400,000  
Reclassification of ales return and allowance from accounts receivable to accrued expenses $ 30,700,000      
Increase in liabilities 30,700,000      
Increase in assets $ 30,700,000      
Domestic [Member]        
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]        
Number of operating retail stores | Store   470    
International [Member]        
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]        
Number of operating retail stores | Store   222