Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Income Tax Effects (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	$ (3,605)	$ 350	$ 2,496
Change in other comprehensive (loss) gain before reclassifications	(6,514)	(1,551)	(6,839)
Reclassification adjustments for items included in Net Income	5,084	(2,404)	4,693
Total other comprehensive (loss) income	(1,430)	(3,955)	(2,146)
Ending balance	(5,035)	(3,605)	350
Derivative Financial Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(3,504)	357	2,350
Change in other comprehensive (loss) gain before reclassifications	(1,574)	(1,482)	(6,833)
Reclassification adjustments for items included in Net Income	5,084	(2,379)	4,840
Total other comprehensive (loss) income	3,510	(3,861)	(1,993)
Ending balance	6	(3,504)	357
Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(101)	(7)	146
Change in other comprehensive (loss) gain before reclassifications	(4,940)	(69)	(6)
Reclassification adjustments for items included in Net Income		(25)	(147)
Total other comprehensive (loss) income	(4,940)	(94)	(153)
Ending balance	$ (5,041)	$ (101)	$ (7)