Total Debt (Parenthetical) (Detail)	0 Months Ended	9 Months Ended	12 Months Ended
	Apr. 17, 2013	Sep. 30, 2014	Dec. 31, 2013
Senior Secured Credit Facility [Member] | Term A due on April 17, 2018 [Member]
Debt Instrument [Line Items]
Debt, maturity date	Apr. 17, 2018	Apr. 17, 2018	Apr. 17, 2018
Margin interest rate		2.50%
Senior Secured Credit Facility [Member] | Term B due on April 17, 2020 [Member]
Debt Instrument [Line Items]
Debt, maturity date	Apr. 17, 2020	Apr. 17, 2020	Apr. 17, 2020
Senior Secured Credit Facility [Member] | Term B due on April 17, 2020 [Member] | LIBOR Floor [Member]
Debt Instrument [Line Items]
Margin interest rate		0.75%	0.75%
Senior Secured Credit Facility [Member] | Term B due on April 17, 2020 [Member] | Applicable Margin [Member]
Debt Instrument [Line Items]
Margin interest rate		2.75%	2.75%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, maturity date		Apr. 17, 2018
Revolving Credit Facility [Member] | Expiring on April 17, 2018 [Member]
Debt Instrument [Line Items]
Debt, maturity date	Apr. 17, 2018	Apr. 17, 2018	Apr. 17, 2018