Share-Based Compensation and Other Benefit Plans - Fair Value of Each Award Estimated on Date of Grant Using Black-Scholes-Merton Option-Pricing Formula (Detail) - Performance Restricted Stock Units [Domain]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Expected volatility, min		59.63%
Expected volatility, max	49.90%	62.18%
Dividend yield	0.00%	0.00%
Risk-free interest rate, min		1.44%
Risk-free interest rate, max	1.66%	1.51%