Other Comprehensive Income (Loss) - Components of Other Comprehensive Gain (Loss) and Related Income Tax Effects (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (5,035)	$ (3,605)	$ 350
Change in other comprehensive loss before reclassifications	(6,559)	(6,514)	(1,551)
Reclassification adjustments for items included in Net Income (Loss)	11,595	5,084	(2,404)
Total other comprehensive gain (loss)	5,036	(1,430)	(3,955)
Ending balance	1	(5,035)	(3,605)
Derivative Financial Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	6	(3,504)	357
Change in other comprehensive loss before reclassifications		(1,574)	(1,482)
Reclassification adjustments for items included in Net Income (Loss)	(5)	5,084	(2,379)
Total other comprehensive gain (loss)	(5)	3,510	(3,861)
Ending balance	1	6	(3,504)
Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(5,041)	(101)	(7)
Change in other comprehensive loss before reclassifications	(6,559)	(4,940)	(69)
Reclassification adjustments for items included in Net Income (Loss)	11,600		(25)
Total other comprehensive gain (loss)	$ 5,041	(4,940)	(94)
Ending balance		$ (5,041)	$ (101)