Combined Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014
Class A common stock
Common stock, par value per share (in dollars per share)	$ 0.001
Common stock, authorized shares	600,000,000
Common stock, issued shares	51,431,872
Common stock, outstanding shares	51,431,872
Class B common stock
Common stock, no par value (in dollars per share)
Common stock, authorized shares	100,000,000
Common stock, issued shares	47,647,023
Common stock, outstanding shares	47,647,023