Other Comprehensive Income - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at the beginning of the period			$ (1,979)	$ (1,745)
Other comprehensive (loss) income before reclassifications			(251)	908
Net losses (gains) reclassified from accumulated other comprehensive loss			(140)	215
Net other comprehensive (loss) income	$ 817	$ 1,082	(391)	1,123
Balance at the end of the period	(2,370)	(622)	(2,370)	(622)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at the beginning of the period			(2,119)	(1,590)
Other comprehensive (loss) income before reclassifications			(391)	920
Net losses (gains) reclassified from accumulated other comprehensive loss			0	0
Net other comprehensive (loss) income			(391)	920
Balance at the end of the period	(2,510)	(670)	(2,510)	(670)
Unrealized Net Gains (Losses) on Marketable Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at the beginning of the period			140	124
Other comprehensive (loss) income before reclassifications			0	11
Net losses (gains) reclassified from accumulated other comprehensive loss			(140)	0
Net other comprehensive (loss) income			(140)	11
Balance at the end of the period	0	135	0	135
Derivatives Qualifying as Cash Flow Hedges [Member] | Interest Rate Swap [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at the beginning of the period			0	(279)
Other comprehensive (loss) income before reclassifications			0	(23)
Net losses (gains) reclassified from accumulated other comprehensive loss			0	215
Net other comprehensive (loss) income			0	192
Balance at the end of the period	0	(87)	0	(87)
Derivatives Qualifying as Cash Flow Hedges [Member] | Foreign Exchange Contract [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at the beginning of the period			0	0
Other comprehensive (loss) income before reclassifications			140	0
Net losses (gains) reclassified from accumulated other comprehensive loss			0	0
Net other comprehensive (loss) income			140	0
Balance at the end of the period	$ 140	$ 0	$ 140	$ 0