Derivative Financial Instruments - Summary of the Fair Value Amounts of Derivative Instruments (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Significant Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Derivative assets	$ 5,324	$ 3,379
Derivative liabilities	441	33
Net derivative asset (liability)	4,883	3,346
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Net derivative asset (liability)	4,900
Designated as Hedging Instrument | Significant Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Derivative assets	5,324	3,369
Derivative liabilities	389	33
Designated as Hedging Instrument | Significant Observable Inputs (Level 2) | Forward Currency Contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	176
Designated as Hedging Instrument | Significant Observable Inputs (Level 2) | Forward Currency Contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivative liabilities	0	33
Designated as Hedging Instrument | Significant Observable Inputs (Level 2) | Interest Rate Swaps | Other non-current assets
Derivatives, Fair Value [Line Items]
Derivative assets	5,324	3,193
Designated as Hedging Instrument | Significant Observable Inputs (Level 2) | Interest Rate Swaps | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	389	0
Not Designated as Hedging Instrument | Significant Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Derivative assets	0	10
Derivative liabilities	52	0
Not Designated as Hedging Instrument | Significant Observable Inputs (Level 2) | Forward Currency Contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	10
Not Designated as Hedging Instrument | Significant Observable Inputs (Level 2) | Forward Currency Contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 52	$ 0