Quarterly report pursuant to Section 13 or 15(d)

Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail)

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Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 97,929 $ 96,724
Other comprehensive income before reclassifications 128 9
Amounts reclassified from accumulated other comprehensive loss 170 205
Total other comprehensive income 298 214
Ending Balance 103,200 94,164
Pension and Other Postretirement Benefits Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (7,698) (9,472)
Amounts reclassified from accumulated other comprehensive loss 170 205
Total other comprehensive income 170 205
Ending Balance (7,528) (9,267)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 301 (84)
Other comprehensive income before reclassifications 128 9
Total other comprehensive income 128 9
Ending Balance 429 (75)
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (7,397) (9,556)
Ending Balance $ (7,099) $ (9,342)