Employee Benefit Plans - Additional Information (Detail) - USD ($)	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 15, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Percentage of employee contributions matched			100.00%
Percentage of employee's salary matched, maximum			4.00%
Defined contribution plan, maximum annual contributions per employee, amount			$ 11,000	$ 10,800	$ 10,600
Matching contributions	$ 0	$ 0	$ 0	$ 0