Summary of Significant Accounting Policies -Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 01, 2019
Significant Accounting Policies [Line Items]
Operating lease assets	$ 463,081
Operating lease liabilities	$ 457,498
Accounting Standards Update 2016-02 [Member]
Significant Accounting Policies [Line Items]
Operating lease assets		$ 483,500
Operating lease liabilities		$ 476,000