Debt and Short-Term Borrowings - Total Debt (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Note Payable due on October 1, 2017 [Member]
Debt Instrument [Line Items]
Debt, maturity date	Oct. 01, 2017	Oct. 01, 2017
Note Payable due on July 1, 2017 [Member]
Debt Instrument [Line Items]
Debt, maturity date	Jul. 01, 2017	Jul. 01, 2017
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
Margin interest rate	2.50%	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
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