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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2014
Equity [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table presents the weighted-average assumptions used to estimate the fair values of the stock options granted in the periods presented. The weighted average estimated fair value of options granted has been retroactively adjusted to reflect the effects the Stock Split:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2014
 
2013
 
2014
 
(unaudited)
 
(unaudited)
 
 
 
 
 
 
 
 
Risk-free interest rate
N/A
 
N/A
 
0.9%
 
N/A
Expected volatility
N/A
 
N/A
 
29%
 
N/A
Expected life (in years)
N/A
 
N/A
 
5.8
 
N/A
Dividend yield
N/A
 
N/A
 
0%
 
N/A
Weighted-average estimated fair value of options granted during the period
N/A
 
N/A
 
$107.20
 
N/A
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes the activities for our stock options for the nine months ended September 30, 2014 and has been retroactively adjusted to reflect the effects of the Stock Split:
 
Options Outstanding
 
Number of
Shares
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in millions) (1)
 
(unaudited)
Balance as of December 31, 2013
10,065,726

 
$
215.50

 
 
 
 
Granted
0

 
$
0.00

 
 
 
 
Exercised
(2,009,381
)
 
$
202.51

 
 
 
 
Forfeited/canceled
(484,449
)
 
$
296.55

 
 
 
 
Balance as of September 30, 2014
7,571,896

 
$
214.25

 
4.6
 
$
2,792

Exercisable as of September 30, 2014
6,403,498

 
$
196.89

 
4.1
 
$
2,472

Exercisable as of September 30, 2014 and expected to vest thereafter (2)
7,445,592

 
$
212.64

 
4.6
 
$
2,757


(1) 
The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of $588.41 and $577.36 for our Class A common stock and Class C capital stock, respectively, on September 30, 2014.
(2) 
Options expected to vest reflect an estimated forfeiture rate.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes the activities for our unvested restricted stock units (RSUs) for the nine months ended September 30, 2014 and has been retroactively adjusted to reflect the effects of the Stock Split:
 
Unvested Restricted Stock Units
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
 
(unaudited)
Unvested as of December 31, 2013
21,953,960

 
$
359.20

Granted
13,948,683

 
$
576.56

 Vested
(8,022,977
)
 
$
345.11

 Forfeited/canceled
(1,129,258
)
 
$
369.27

Unvested as of September 30, 2014
26,750,408

 
$
476.08

Expected to vest after September 30, 2014 (1)
23,858,689

 
$
476.08

(1) 
RSUs expected to vest reflect an estimated forfeiture rate.