Equity-Based Compensation (Details 2) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Nov. 12, 2014
Restricted stock awards
Number of shares
Total granted and unvested at the beginning of the period (in shares)	45,093
Granted (in shares)	1,970,587
Vested (in shares)	(21,825)
Forfeited (in shares)	(10,182)
Total awarded and unvested at the end of the period (in shares)	1,983,673
Weighted average grant date fair value
Total granted and unvested at the beginning of the period (in dollars per share)	$ 54.27
Granted (in dollars per share)	$ 64.75
Vested (in dollars per share)	$ 57.06
Forfeited (in dollars per share)	$ 58.55
Total awarded and unvested at the end of the period (in dollars per share)	$ 64.71
Aggregate intrinsic value
Total awarded and unvested at the beginning of the period	$ 2,861,000
Total awarded and unvested at the end of the period	80,497,000
Unrecognized stock-based compensation expense	$ 103,800,000
Weighted average period for recognizing unrecognized stock-based compensation expense	3 years 3 months 18 days
Restricted units
Number of shares
Granted (in shares)		20,000