Summary of Significant Accounting Policies - Calculation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounting Policies [Abstract]
Net Income (Loss)	$ (1,015,639)	$ (96,229)
Basic weighted-average common shares outstanding in period (in shares)	211,111,830	209,931,744
Diluted weighted-average common shares outstanding in period (in shares)	211,111,830	209,931,744
Basic net income (loss) per common share (in dollars per share)	$ (4.81)	$ (0.46)
Diluted net income (loss) per common share (in dollars per share)	$ (4.81)	$ (0.46)