Accumulated Other Comprehensive Income (Loss) - Changes in Balances of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,489)	$ (428)	$ 861
Other comprehensive income (loss) before reclassifications	(814)	(1,714)	746
Amounts reclassified to net loss	972	653	(2,035)
Other comprehensive income (loss)	158	(1,061)	(1,289)
Ending Balance	(1,331)	(1,489)	(428)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,428)	(426)	691
Other comprehensive income (loss) before reclassifications	(565)	(1,655)	712
Amounts reclassified to net loss	972	653	(1,829)
Other comprehensive income (loss)	407	(1,002)	(1,117)
Ending Balance	(1,021)	(1,428)	(426)
Unrealized Gain (Loss) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(61)	(2)	170
Other comprehensive income (loss) before reclassifications	(249)	(59)	34
Amounts reclassified to net loss	0	0	(206)
Other comprehensive income (loss)	(249)	(59)	(172)
Ending Balance	$ (310)	$ (61)	$ (2)