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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock and RSU to be Settled in Common Stock Activity
A summary of the activity for RSUs to be settled in common stock for the year ended December 31, 2017 is as follows (shares in thousands):
 
Shares
 
Weighted Average
Grant Date Fair Value
(Per share)
Unvested at December 31, 2016
2,711

 
$25.45
Granted
1,459

 
$37.06
Vested
(1,489
)
 
$28.03
Forfeited
(81
)
 
$27.58
Unvested at December 31, 2017
2,600

 
$30.42
Grant Date Fair Value for Awards of Performance Units Inputs
The grant date fair value for awards of performance units with market-based metrics, which were granted in the year ended December 31, 2017, was based on a fair value as determined using a Monte Carlo simulation valuation methodology using the following key inputs:
Valuation date stock price based on the March 22, 2017 closing stock price
$36.31
Expected volatility
36.00
%
Risk-free interest rate
1.46
%
Term in years
2.78