Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Publicly traded equity securities	$ 5,884	$ 2,779
Derivative instruments	43,894	57,707
Total financial assets	730,259	954,616
Liabilities:
Derivative instruments	118,638	35,612
Money market and deposit accounts
Assets:
Cash and cash equivalents	672,179	886,547
Certificates of deposit
Assets:
Cash and cash equivalents	8,302	7,583
Level 1
Assets:
Publicly traded equity securities	5,884	2,779
Derivative instruments	0	0
Total financial assets	678,063	889,326
Liabilities:
Derivative instruments	0	0
Level 1 | Money market and deposit accounts
Assets:
Cash and cash equivalents	672,179	886,547
Level 1 | Certificates of deposit
Assets:
Cash and cash equivalents	0	0
Level 2
Assets:
Publicly traded equity securities	0	0
Derivative instruments	43,894	57,707
Total financial assets	52,196	65,290
Liabilities:
Derivative instruments	118,638	35,612
Level 2 | Money market and deposit accounts
Assets:
Cash and cash equivalents	0	0
Level 2 | Certificates of deposit
Assets:
Cash and cash equivalents	$ 8,302	$ 7,583