Recent Accounting Standards - Summary Impact of ASU 2020-06 on Opening Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred tax liabilities (assets)		$ 8,211	$ 26
Convertible senior notes, net		486,366	0
Additional paid-in capital		763,051	593,583
Retained earnings		575,965	$ 583,489
Pre-ASU 2020-06
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred tax liabilities (assets)		8,211
Convertible senior notes, net		486,366
Additional paid-in capital		763,051
Retained earnings		$ 575,965
ASU 2020-06
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred tax liabilities (assets)	$ (41,693)
Convertible senior notes, net	148,546
Additional paid-in capital	(107,810)
Retained earnings	957
As Adjusted
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Deferred tax liabilities (assets)	(33,482)
Convertible senior notes, net	634,912
Additional paid-in capital	655,241
Retained earnings	$ 576,922