Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.10.0.1
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Area Of Office Space | ft² 250,000    
Operating Leases, Rent Expense, Net $ 4.1 $ 4.7 $ 4.2
Weighted average interest rate of debt 4.56%    
Salaries, Wages and Officers' Compensation $ 2.1