Accumulated Other Comprehensive Loss - Changes in Balances of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 240,201	[1]	$ 97,243
Other comprehensive income (loss) before reclassifications	$ 200	$ (192)	576		(43)
Amounts reclassified to net loss	(106)	48	(14)		414
Other comprehensive income (loss)	94	(144)	562		371
Ending balance	224,471	227,426	224,471		227,426
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(759)	(851)	(1,021)		(1,428)
Other comprehensive income (loss) before reclassifications	330	(200)	500		11
Amounts reclassified to net loss	(106)	48	(14)		414
Other comprehensive income (loss)	224	(152)	486		425
Ending balance	(535)	(1,003)	(535)		(1,003)
Unrealized Gain (Loss) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(104)	(123)	(310)		(61)
Other comprehensive income (loss) before reclassifications	(130)	8	76		(54)
Other comprehensive income (loss)	(130)	8	76		(54)
Ending balance	(234)	(115)	(234)		(115)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(863)	(974)	(1,331)		(1,489)
Ending balance	$ (769)	$ (1,118)	$ (769)		$ (1,118)

[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.