Derivatives Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (loss) recognized in income statement			$ 421	$ 778
Derivatives Not Designated as Hedge Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (loss) recognized in income statement	$ 36	$ 338	488	509
Forward Currency Contracts [Member] | Derivatives Not Designated as Hedge Instrument [Member] | Foreign Currency Transaction (Losses) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (loss) recognized in income statement	37	(22)	133	(332)
Forward Currency Contracts [Member] | Derivatives Not Designated as Hedge Instrument [Member] | Income from Operations of Discontinued Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (loss) recognized in income statement		(32)		54
Interest Rate Swap Contracts [Member] | Derivatives Not Designated as Hedge Instrument [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (loss) recognized in income statement	$ (1)	$ 392	$ 355	$ 787