Recent Accounting Pronouncements - Summary of Cumulative Effect of Adoption on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Inventories	$ 178,506		$ 45,543
Prepaid expenses and other current assets	35,092		20,310
Property and equipment, net	532,148		656,038
Other non-currentassets	70,739		67,107
Liabilities
Current deferred revenue	37,275		43,448
Other non-currentliabilities	83,887		134,655
Equity
Accumulated deficit	(1,132,146)		$ (1,089,369)
Accounting Standards Update 2014-09 And 340-40 [Member]
Assets
Inventories		$ 46,517
Prepaid expenses and other current assets		20,913
Property and equipment, net	2,200	650,756
Other non-currentassets		37,101
Liabilities
Current deferred revenue		36,266
Other non-currentliabilities		86,277
Equity
Accumulated deficit		$ (1,067,520)
Accounting Standards Update 2014-09 And 340-40 [Member] | Difference between Guidance in Effect Before and after Topic 606 and ASC 34040 [Member]
Assets
Inventories	974
Prepaid expenses and other current assets	603
Property and equipment, net	(5,282)
Other non-currentassets	(30,006)
Liabilities
Current deferred revenue	(7,182)
Other non-currentliabilities	(48,378)
Equity
Accumulated deficit	$ 21,849