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Income Taxes - Schedule of Income Tax Provisions (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
U.S. federal $ 67,632 $ 21,272  
State and local 5,902 2,608 $ 2,015
Total current provision 73,534 23,880 2,015
Deferred:      
U.S. federal 23,137 483 6,124
State and local 4,872 1,322 42
Total deferred provision 28,009 1,805 6,166
Total tax provision $ 101,543 $ 25,685 $ 8,181