Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 96,724 $ 98,966
Other comprehensive income before reclassifications 9 (87)
Amounts reclassified from accumulated other comprehensive loss 205 194
Total other comprehensive income 214 107
Ending Balance 94,164 97,945
Pension and Other Postretirement Benefits Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (9,472) (8,947)
Amounts reclassified from accumulated other comprehensive loss 205 194
Total other comprehensive income 205 194
Ending Balance (9,267) (8,753)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (84) 114
Other comprehensive income before reclassifications 9 (87)
Total other comprehensive income 9 (87)
Ending Balance (75) 27
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (9,556) (8,833)
Ending Balance $ (9,342) $ (8,726)