Performance Awards - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Perfomance granted	$ 0
2014 EIP | Performance Awards
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Performance period	3 years
Perfomance granted	$ 4,608,000
Unrecognized expense	$ 1,100,000	$ 2,600,000