Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income/(loss), beginning balance $ 109,380  
Accumulated other comprehensive income/(loss), ending balance 108,667  
Pension and Other Postretirement Benefits Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income/(loss), beginning balance (10,932) $ (9,462)
Amounts reclassified from accumulated other comprehensive loss 225 196
Net current-period other comprehensive income 225 196
Accumulated other comprehensive income/(loss), ending balance (10,707) (9,266)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income/(loss), beginning balance 256 406
Other comprehensive income before reclassifications (138) (1)
Net current-period other comprehensive income (138) (1)
Accumulated other comprehensive income/(loss), ending balance 118 405
AOCI Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income/(loss), beginning balance (10,676) (9,056)
Other comprehensive income before reclassifications (138) (1)
Amounts reclassified from accumulated other comprehensive loss 225 196
Net current-period other comprehensive income 87 195
Accumulated other comprehensive income/(loss), ending balance $ (10,589) $ (8,861)