Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 103,349  
Other comprehensive income before reclassifications (199) $ 54
Amounts reclassified from accumulated other comprehensive loss 170 170
Total other comprehensive income (29) 224
Ending Balance 103,952  
Pension and Other Postretirement Benefits Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (8,599) (8,439)
Amounts reclassified from accumulated other comprehensive loss 170 170
Total other comprehensive income 170 170
Ending Balance (8,429) (8,269)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 349 5
Other comprehensive income before reclassifications (199) 54
Total other comprehensive income (199) 54
Ending Balance 150 59
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (8,250) (8,434)
Ending Balance $ (8,279) $ (8,210)