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Debt - Long-Term Debt (Detail) - USD ($)
Dec. 31, 2017
Dec. 11, 2017
Mar. 31, 2017
Debt Instrument [Line Items]      
Total $ 291,030,000   $ 350,361,000
Unamortized debt issuance costs (3,216,000)   (1,723,000)
Current maturities (26,833,000)   (37,789,000)
Long-term debt obligation 260,981,000   310,849,000
Equipment Financing [Member]      
Debt Instrument [Line Items]      
Revolving credit facility 3,560,000   4,216,000
ADS [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit facility 161,300,000   194,300,000
ADS Mexicana [Member]      
Debt Instrument [Line Items]      
Revolving credit facility     1,500,000
ADS Mexicana [Member] | Scotia Bank Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit facility   $ 0 1,000,000
Term Note [Member]      
Debt Instrument [Line Items]      
Term Note     72,500,000
Senior Notes Payable [Member]      
Debt Instrument [Line Items]      
Senior notes 125,000,000   75,000,000
Industrial Revenue Bonds [Member]      
Debt Instrument [Line Items]      
Industrial revenue bonds $ 1,170,000   $ 1,845,000