Quarterly report pursuant to Section 13 or 15(d)

Line of Credit, Short-Term and Long-Term Borrowings - Additional Information (Detail)

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Line of Credit, Short-Term and Long-Term Borrowings - Additional Information (Detail) - USD ($)
6 Months Ended
Aug. 11, 2015
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2015
Nov. 16, 2012
Apr. 30, 2010
Debt Instrument [Line Items]            
Outstanding letters of credit   $ 14,100,000 $ 4,400,000      
Short-term borrowings   $ 11,179,000 8,011,000      
Derivative effective dates   Aug. 12, 2015        
Joint Venture with HF Logistics [Member] | Construction Loan Agreement [Member] | Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Interest rate swap agreement date   Aug. 14, 2015        
Derivative effective dates   Aug. 12, 2015        
Maturity date of swap agreement   Aug. 12, 2022        
Derivative early termination date   Aug. 01, 2020        
Effective fixed interest rate of loan with swap   4.08%        
Original Modified Loan [Member] | Joint Venture with HF Logistics [Member] | Construction Loan Agreement [Member]            
Debt Instrument [Line Items]            
Debt instrument maturity date   Oct. 30, 2015        
Modification Loan [Member] | Joint Venture with HF Logistics [Member] | Construction Loan Agreement [Member]            
Debt Instrument [Line Items]            
Debt instrument maturity date   Aug. 12, 2020        
Outstanding principal balance of the original loan $ 77,300,000          
Capital contribution made by the company 38,700,000          
Ownership percentage joint venture   50.00%        
Current borrowing capacity $ 70,000,000          
Payment of accrued interest, loan fees and other closing costs   $ 900,000        
Distribution made by JV   $ 31,300,000        
Description of maturity date of debt instrument   The maturity date of the New Loan is August 12, 2020, which HF-T1 has one option to extend by an additional 24 months, or until August 12, 2022, upon payment of a fee and satisfaction of certain customary conditions.        
LIBOR Loans [Member] | Modification Loan [Member] | Joint Venture with HF Logistics [Member] | Construction Loan Agreement [Member]            
Debt Instrument [Line Items]            
Interest rate of line of credit agreement   2.00%        
Debt instrument basis spread on variable rate   LIBOR Daily Floating Rate (as defined in the Amended Loan Agreement) plus a margin of 2%.        
Maximum [Member] | Equipment Notes [Member]            
Debt Instrument [Line Items]            
Borrowing under loan agreement         $ 80,000,000  
Maximum [Member] | Original Loan [Member] | Joint Venture with HF Logistics [Member] | Construction Loan Agreement [Member]            
Debt Instrument [Line Items]            
Borrowing under loan agreement           $ 55,000,000
Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum amount of credit facility       $ 250,000,000    
Maturity date of credit agreement   Jun. 30, 2020        
Line of credit facility, interest rate   Borrowings bear interest at the Company’s election based on (a) LIBOR or (b) the greater of (i) the Prime Rate, (ii) the Federal Funds Rate plus 0.5% and (iii) LIBOR for a 30-day period plus 1.0%, in each case, plus an applicable margin based on the average daily principal balance of revolving loans available under the Credit Agreement.        
Unused line of credit fee   0.25%        
Line of credit facility, expiration period   5 years        
Line of credit facility, outstanding amount   $ 100,000 $ 100,000      
Line of Credit [Member] | Other Assets [Member]            
Debt Instrument [Line Items]            
Debt closing and arrangement fees   $ 1,100,000        
Line of Credit [Member] | Federal Funds Rate [Member]            
Debt Instrument [Line Items]            
Interest rate of line of credit agreement   0.50%        
Line of Credit [Member] | LIBOR Loans [Member]            
Debt Instrument [Line Items]            
Interest rate of line of credit agreement   1.00%        
Line of Credit [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Line of credit, increase       $ 100,000,000