General - Additional Information (Detail) - IPO [Member] - Class B Common Stock [Member] - Subsequent Event [Member] $ / shares in Units, $ in Thousands	Apr. 05, 2017 USD ($) $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Share issued during the period | shares	20,145,000
Share issued, price per share | $ / shares	$ 19
Proceeds from initial public offering	$ 382,755
Expenses related to the offering	42,485
Net proceeds from initial public offering	$ 340,270