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Business Segments Information - Schedule of Revenue from Reportable Segments by Product Type (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]    
Net sales $ 413,708 $ 387,847
Domestic [Member]    
Segment Reporting Information [Line Items]    
Net sales 374,375 342,498
Domestic [Member] | Pipe [Member]    
Segment Reporting Information [Line Items]    
Net sales 262,121 242,026
Domestic [Member] | Allied Products [Member]    
Segment Reporting Information [Line Items]    
Net sales 112,254 100,472
International Segment [Member]    
Segment Reporting Information [Line Items]    
Net sales 39,333 45,349
International Segment [Member] | Pipe [Member]    
Segment Reporting Information [Line Items]    
Net sales 29,284 34,448
International Segment [Member] | Allied Products [Member]    
Segment Reporting Information [Line Items]    
Net sales $ 10,049 $ 10,901