Annual report pursuant to Section 13 and 15(d)

Share Repurchase Program - Summary of Class A Common Stock Repurchase Activities (Detail)

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Share Repurchase Program - Summary of Class A Common Stock Repurchase Activities (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]    
Total cost of shares repurchased (in thousands): $ 30,019 $ 99,977
Class A Common Stock [Member]    
Class of Stock [Line Items]    
Shares repurchased 968,724 3,656,277
Average cost per share $ 30.99 $ 27.34
Total cost of shares repurchased (in thousands): $ 30,019 $ 99,977