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 ($)
 9 Months Ended
Sep. 30, 2015
Aug. 11, 2015
Dec. 31, 2014
Line Of Credit Facility [Line Items]      
Outstanding letters of credit $ 2,100,000   $ 3,400,000
Short-term borrowings 57,000   1,810,000
Increase in maximum amount of credit facility 100,000,000    
Maximum limit for letters of credit $ 100,000,000    
Line of credit facility, expiration period 5 years    
Line of credit facility, outstanding amount $ 100,000   $ 100,000
Interest rate swap agreement date Aug. 12, 2015    
Maturity date of swap agreement Aug. 12, 2022    
Joint Venture with HF Logistics [Member]      
Line Of Credit Facility [Line Items]      
Capital contribution made by the company $ 38,700,000    
Ownership percentage joint venture 50.00%    
Interest Rate Swap | Joint Venture with HF Logistics [Member]      
Line Of Credit Facility [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%    
Credit Agreement      
Line Of Credit Facility [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%    
Debt closing and arrangement fees $ 1,100,000    
Credit Agreement | Federal Funds Rate [Member]      
Line Of Credit Facility [Line Items]      
Line of credit facility, interest rate Federal Funds Rate plus 0.5%    
Interest rate of line of credit agreement 0.50%    
Credit Agreement | LIBOR Loans [Member]      
Line Of Credit Facility [Line Items]      
Line of credit facility, interest rate LIBOR for a 30-day period plus 1.0%    
Interest rate of line of credit agreement 1.00%    
Original Loan | Joint Venture with HF Logistics [Member]      
Line Of Credit Facility [Line Items]      
Outstanding principal balance of the original loan   $ 77,300,000  
Original Loan | Construction Loan Agreement      
Line Of Credit Facility [Line Items]      
Original maximum limit of borrowing under loan agreement $ 55,000,000    
Increase in borrowings under Loan $ 80,000,000    
Debt instrument maturity date Oct. 30, 2015    
New Loan | Joint Venture with HF Logistics [Member]      
Line Of Credit Facility [Line Items]      
Debt instrument maturity date Aug. 12, 2020    
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    
New Loan | LIBOR Loans [Member] | Joint Venture with HF Logistics [Member]      
Line Of Credit Facility [Line Items]      
Line of credit facility, interest rate Floating Rate (as defined in the Amended Loan Agreement) plus a margin of 2%.    
Interest rate of line of credit agreement 2.00%