XML 121 R90.htm IDEA: XBRL DOCUMENT v3.20.1
Redeemable Non-Controlling Interest - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jul. 07, 2017
Jul. 01, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2016
Jan. 06, 2016
Redeemable Noncontrolling Interest [Line Items]                
Noncontrolling interest, change in redemption value   $ 14,200            
Excess accretion of non-controlling interest     $ 0 $ 0 $ 7,247 $ 6,800    
WZ (UK) Ltd.                
Redeemable Noncontrolling Interest [Line Items]                
Redeemable noncontrolling interest, equity, fair value               $ 10,800
Exercised call option               $ 30,000
Business acquisition, estimated aggregate purchase price $ 25,000 $ 25,000         $ 33,400  
Ownership interest         86.40%     57.50%
WZ (UK) Ltd.                
Redeemable Noncontrolling Interest [Line Items]                
Noncontrolling interest, ownership percentage   13.60%