Long-Term Debt - 2011 Amended Credit Agreement - Additional Information (Detail)	12 Months Ended			12 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2014 2011 Amended Credit Agreement [Member] USD ($) Tranches	Dec. 31, 2014 2011 Amended Credit Agreement [Member] EUR (€)	Dec. 31, 2014 2011 Amended Credit Agreement [Member] Revolving Credit Facility [Member]	Dec. 31, 2014 2011 Amended Credit Agreement [Member] Term A Loan [Member]
Credit Facilities [Line Items]
Number of tranches of term loan				2
Aggregate principal amount		$ 92,900,000		$ 1,600,000,000	€ 200,000,000
Senior secured revolving credit facility				150,000,000
Maturity date of loan	Dec. 12, 2019					Oct. 19, 2016	Oct. 19, 2016
Excess amount of letter of credit			$ 4,600,000	$ 50,000,000
Commitment under revolving credit facility				30.00%