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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 23, 2018
Jan. 31, 2016
Jan. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Commitments And Contingencies [Line Items]            
Capital Leases, Contingent Rental Payments Due   $ 8,050 $ 7,641     $ 9,910
Capital Leases of Lessee, Contingent Rentals, Basis Spread on Variable Rate   3.625% 3.625%     3.00%
Capital Lease, Weighted Average Remaining Lease Term   2 years 2 years      
Lease Commitment   $ 1 $ 1      
Operating Leases, Rent Expense, Net       $ 2,400,000 $ 2,400,000  
Subsequent Event [Member]            
Commitments And Contingencies [Line Items]            
Loss Contingency, Damages Sought, Value $ 5,000,000