Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.7.0.1
Stockholders' Equity - Additional Information (Detail) - shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Class B Common Stock [Member]    
Class of Stock [Line Items]    
Certain Class B stockholders converted into Class A 0 1,050,862