Accumulated Other Comprehensive Loss - Changes in Balances of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,331)	[1]	$ (1,489)
Other comprehensive income (loss) before reclassifications	891		(406)
Amounts reclassified to net loss	194		320
Other comprehensive income (loss)	1,085		(86)
Ending Balance	(246)		(1,575)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,021)		(1,428)
Other comprehensive income (loss) before reclassifications	722		(450)
Amounts reclassified to net loss	194		320
Other comprehensive income (loss)	916		(130)
Ending Balance	(105)		(1,558)
Unrealized Gain (Loss) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(310)		(61)
Other comprehensive income (loss) before reclassifications	169		44
Other comprehensive income (loss)	169		44
Ending Balance	$ (141)		$ (17)

[1] The Condensed Consolidated Balance Sheet as of December 31, 2015 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.