Stock-Based Compensation and Stock Awards - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized expense	$ 0	$ 0	$ 0	$ 0
2016 Performance Share Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 4,300,000
Percentage of performance metrics criteria	200.00%		200.00%
Former Chief Operating Officer | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense			$ 1,800,000
Former Chief Operating Officer | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense			2,400,000
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 7,700,000	$ 2,400,000	$ 15,700,000	$ 10,000,000.0