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Debt - Additional Information (Detail) - USD ($)
4 Months Ended 6 Months Ended
Feb. 22, 2017
Jun. 30, 2017
Jun. 30, 2017
Debt Instrument [Line Items]      
FILO borrowing base percentage of accounts receivable   10.00% 10.00%
FILO borrowing base percentage of liquidation value of inventory   10.00% 10.00%
Maximum amount of financing upon amendment of program   $ 200,000,000 $ 200,000,000
Letters of credit issued amount   177,500,000 $ 177,500,000
2017 Credit Agreement [Member]      
Debt Instrument [Line Items]      
Credit agreement commencement date     Feb. 22, 2017
Credit agreement period 5 years    
Line of credit facility, interest rate description     Borrowings under the 2017 Credit Agreement bear interest at LIBOR for specified interest periods, at the REVLIBOR30 Rate (as defined in the 2017 Credit Agreement) or at the Alternate Base Rate (as defined in the 2017 Credit Agreement), plus, in each case, a margin determined based on the Company’s average quarterly revolving availability. Depending on the Company’s average quarterly revolving availability, the margin on LIBOR-based loans and REVLIBOR30 Rate-based loans ranges from 1.25% to 1.75% for revolving and term loans and 2.00% to 2.50% for FILO loans, and on Alternate Base Rate loans ranges from 0.25% to 0.75% for revolving and term loans and 1.00% to 1.50% for FILO loans. From February 22, 2017 (the date of the 2017 Credit Agreement) to June 30, 2017, the applicable margin for LIBOR-based loans and REVLIBOR30 Rate-based loans is 1.50% for revolving and term loans and 2.25% for FILO loans, and for Alternate Base Rate loans is 0.50% for revolving and term loans and 1.25% for FILO loans. In addition, ECO is required to pay the lenders a commitment fee on the unutilized portion of the revolving and FILO commitments under the 2017 Credit Agreement at a rate per annum equal to 0.25%.
Unamortized deferred financing fees   7,000,000 $ 7,000,000
Borrowing base calculation, description     Availability of credit under the revolving facility will be subject to a revolving borrowing base calculation comprised of a certain percentage of the eligible accounts receivable, plus a certain percentage of the inventory, less reserves. Similarly, availability under the FILO revolving credit facility is subject to a FILO borrowing base comprised primarily of 10% of the eligible accounts receivable, plus 10% multiplied by the net orderly liquidation value percentages of the eligible inventory, less reserves.
2017 Credit Agreement [Member] | LIBOR Loans [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate     0.125%
2017 Credit Agreement [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 1,000,000,000 $ 1,000,000,000
Alternate base rate loans rates   0.50%  
Fee on unutilized portion of commitments     0.25%
2017 Credit Agreement [Member] | Revolving Credit Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates   1.50% 1.50%
2017 Credit Agreement [Member] | First In Last Out Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 100,000,000 $ 100,000,000
Alternate base rate loans rates   1.25%  
Fee on unutilized portion of commitments     0.25%
2017 Credit Agreement [Member] | First In Last Out Revolving Credit Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates   2.25% 2.25%
2017 Credit Agreement [Member] | Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 77,600,000 $ 77,600,000
Line of credit facility, funding date     Mar. 24, 2017
Alternate base rate loans rates   0.50%  
Remaining term loan   $ 76,100,000 $ 76,100,000
2017 Credit Agreement [Member] | Term Loan Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates   1.50% 1.50%
2017 Credit Agreement [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt-to-EBITDA ratio     3.50%
Letters of credit issued amount   $ 25,000,000 $ 25,000,000
Letters of credit facility, collateral amount   165,000,000 $ 165,000,000
2017 Credit Agreement [Member] | Maximum [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Alternate base rate loans rates     0.75%
2017 Credit Agreement [Member] | Maximum [Member] | Revolving Credit Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates     1.75%
2017 Credit Agreement [Member] | Maximum [Member] | First In Last Out Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Alternate base rate loans rates     1.50%
2017 Credit Agreement [Member] | Maximum [Member] | First In Last Out Revolving Credit Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates     2.50%
2017 Credit Agreement [Member] | Maximum [Member] | Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Alternate base rate loans rates     0.75%
2017 Credit Agreement [Member] | Maximum [Member] | Term Loan Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates     1.75%
2017 Credit Agreement [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt-to-EBITDA ratio     3.00%
2017 Credit Agreement [Member] | Minimum [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Alternate base rate loans rates     0.25%
2017 Credit Agreement [Member] | Minimum [Member] | Revolving Credit Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates     1.25%
2017 Credit Agreement [Member] | Minimum [Member] | First In Last Out Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Alternate base rate loans rates     1.00%
2017 Credit Agreement [Member] | Minimum [Member] | First In Last Out Revolving Credit Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates     2.00%
2017 Credit Agreement [Member] | Minimum [Member] | Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Alternate base rate loans rates     0.25%
2017 Credit Agreement [Member] | Minimum [Member] | Term Loan Facility [Member] | REVLIBOR30 And LIBOR Based Loan [Member]      
Debt Instrument [Line Items]      
Line of credit facility loan rates     1.25%
3.75% Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 3.75%    
Debt instrument, maturity date     Jan. 15, 2021
2013 Note Purchase Agreement and Amendment No. 4 [Member] | Letter of Credit [Member]      
Debt Instrument [Line Items]      
Letter of credit issued   $ 165,000,000 $ 165,000,000
2013 Note Purchase Agreement [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate     3.75%
Credit facility, frequency of payment and payment terms     Interest under the 2013 Note Purchase Agreement is payable semi-annually at a rate per annum equal to 3.75% (3.66% after the effect of terminating an interest rate swap).
Effective interest rate   3.66% 3.66%