Organization And Summary Of Significant Accounting Policies (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) segment	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 09, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments | segment	1
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating lease liabilities	$ 86,310	$ 82,544
Operating right-of-use assets	79,838	80,544	$ 0
Operating right-of-use assets, net of other liabilities and prepaid expenses		$ 2,000
De-recognition of previously recorded financing obligation	$ 0		$ 46,100
Grovo Learning, Inc.
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
De-recognition of previously recorded financing obligation				$ 46,100