Accumulated Other Comprehensive Income - Changes in Balances of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Mar. 31, 2013 Unrealized gain (loss) on cash flow hedges [Member]	Mar. 31, 2014 Unrealized gain (loss) on cash flow hedges [Member]	Dec. 31, 2013 Unrealized gain (loss) on cash flow hedges [Member]	Mar. 31, 2014 Unrealized gain (loss) on investments [Member]	Mar. 31, 2013 Unrealized gain (loss) on investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (428)	[1]	$ 861	$ 690	$ (426)	$ (426)	$ (2)	$ 171
Other comprehensive income (loss) before reclassifications	3		376	360			3	16
Amounts reclassified to net loss			(306)	(223)				(83)
Other comprehensive income (loss)	3		70	137			3	(67)
Ending Balance	$ (425)		$ 931	$ 827	$ (426)	$ (426)	$ 1	$ 104

[1] The Condensed Consolidated Balance Sheet as of December 31, 2013 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.