Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at the beginning of the period	$ (1,979)	$ (1,745)	$ 76
Other comprehensive income (loss) before reclassifications	(2,190)	(536)	(2,561)
Net losses (gains) reclassified from accumulated other comprehensive loss	(73)	302	740
Net other comprehensive (loss) income	(2,263)	(234)	(1,821)
Balance at the end of the period	(4,242)	(1,979)	(1,745)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at the beginning of the period	(2,119)	(1,590)	892
Other comprehensive income (loss) before reclassifications	(2,381)	(529)	(2,482)
Net losses (gains) reclassified from accumulated other comprehensive loss	0	0	0
Net other comprehensive (loss) income	(2,381)	(529)	(2,482)
Balance at the end of the period	(4,500)	(2,119)	(1,590)
Unrealized Net Gains (Losses) on Marketable Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at the beginning of the period	140	124	118
Other comprehensive income (loss) before reclassifications	0	16	6
Net losses (gains) reclassified from accumulated other comprehensive loss	(140)	0	0
Net other comprehensive (loss) income	(140)	16	6
Balance at the end of the period	0	140	124
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)	(934)
Other comprehensive income (loss) before reclassifications	0	(23)	(85)
Net losses (gains) reclassified from accumulated other comprehensive loss	0	302	740
Net other comprehensive (loss) income	0	279	655
Balance at the end of the period	0	0	(279)
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	0
Other comprehensive income (loss) before reclassifications	191	0	0
Net losses (gains) reclassified from accumulated other comprehensive loss	67	0	0
Net other comprehensive (loss) income	258	0	0
Balance at the end of the period	$ 258	$ 0	$ 0