Basis of Presentation of Interim Financial Information - Initial Public Offering (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended	12 Months Ended
	Jul. 31, 2015	May. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Initial Public Offering
Equity-based compensation			$ 86,745	$ 8,034	$ 9,787
Transaction advisory fee			8,500
Extinguishment of debt			1,750	$ 2,894	$ 7,922
First Lien Credit Agreement
Initial Public Offering
Extinguishment of debt	$ 1,100
First Lien Credit Agreement | Term Loan
Initial Public Offering
Extinguishment of debt			638
Transaction Advisory Fee | Vestar
Initial Public Offering
Transaction advisory fee			$ 8,500
IPO
Initial Public Offering
Equity-based compensation		$ 70,400
IPO | First Lien Credit Agreement | Term Loan
Initial Public Offering
Extinguishment of debt		638
IPO | Transaction Advisory Fee | Vestar
Initial Public Offering
Transaction advisory fee		$ 8,500
IPO | Common
Initial Public Offering
Shares issued in offering		10,235
Share price (in dollars per share)		$ 25.00
Proceeds from the issuance of common stock in initial public offering, net of fees		$ 234,400
IPO, excluding Underwriters' Option | Common
Initial Public Offering
Shares issued in offering		8,900
Underwriters' Option | Common
Initial Public Offering
Shares issued in offering		1,335