Derivative Financial Instruments - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) item	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) item	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Foreign currency unrealized losses expected to be reclassified into earnings over next twelve months	$ (10,600,000)		$ (10,600,000)
Interest Rate Swap Agreements
Derivative [Line Items]
Number of derivative contracts | item	2		2
Interest Rate Swap Agreements | U.S. dollars
Derivative [Line Items]
Variable Rate Basis			LIBOR
Swaps maturing September 2016
Derivative [Line Items]
Average fixed interest rate (as a percent)	1.03%		1.03%
Swaps maturing March 2017
Derivative [Line Items]
Average fixed interest rate (as a percent)	0.89%		0.89%
Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Number of credit contingency features | item			0
Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
Derivative [Line Items]
Gains (losses) in other comprehensive income, effective portion	$ (15,100,000)	$ 7,600,000	$ (9,300,000)	$ (16,000,000)
Designated as Hedging Instrument | Interest Rate Swap Agreements
Derivative [Line Items]
Notional amount	100,000,000		100,000,000
Carrying value / fair value of derivative liabilities included in other liabilities	100,000		100,000		$ 100,000
Designated as Hedging Instrument | Swaps maturing September 2016
Derivative [Line Items]
Notional amount	50,000,000		50,000,000
Designated as Hedging Instrument | Swaps maturing March 2017
Derivative [Line Items]
Notional amount	50,000,000		50,000,000
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Notional amount	415,800,000		415,800,000		417,500,000
Carrying value / fair value of derivative liabilities included in other liabilities	23,000,000		23,000,000		22,100,000
Carrying value / fair value of derivative assets included in other assets	1,200,000		1,200,000		900,000
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
Derivative [Line Items]
Net gain (loss) recognized in gross margin	(3,400,000)	(5,200,000)	(8,500,000)	(8,800,000)
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Carrying value / fair value of derivative liabilities included in other liabilities	1,400,000		1,400,000		400,000
Carrying value / fair value of derivative assets included in other assets	100,000		100,000		$ 400,000
Net gains (losses) on derivative contracts not designated as hedges	$ (1,600,000)	$ 2,500,000	$ 2,700,000	$ 2,500,000