Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 114,110  
Other comprehensive income before reclassifications 54 $ (138)
Amounts reclassified from accumulated other comprehensive loss 170 225
Total other comprehensive income 224 87
Ending Balance 114,203  
Pension and Other Postretirement Benefits Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (8,439) (10,932)
Amounts reclassified from accumulated other comprehensive loss 170 225
Total other comprehensive income 170 225
Ending Balance (8,269) (10,707)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 5 256
Other comprehensive income before reclassifications 54 (138)
Total other comprehensive income 54 (138)
Ending Balance 59 118
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (8,434) (10,676)
Ending Balance $ (8,210) $ (10,589)