Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.5.0.2
Stockholders' Equity - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Class B Common Stock [Member]        
Class of Stock [Line Items]        
Certain Class B stockholders converted into Class A 682,408 2,456,730 1,733,270 3,223,296
Class A Common Stock [Member]        
Class of Stock [Line Items]        
Shares issued as a part of conversion 682,408 2,456,730 1,733,270 3,223,296