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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 1,651,059 $ 2,305,554
Balance 1,125,830 2,218,995
Available for Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (95) (208)
Gains/(losses) recognized in OCI 6 59
Reclasses from OCI to net income 80 102
Net period OCI 86 161
Balance (9) (47)
Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (9,811) (9,811)
Gains/(losses) recognized in OCI 0 0
Balance (9,811) (9,811)
Pension/Post-retirement Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (438) 4,683
Gains/(losses) recognized in OCI 0 0
Balance (438) 4,683
Interest Rate Swaps    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 0 (1,530)
Gains/(losses) recognized in OCI 0 0
Reclasses from OCI to net income   71
Net period OCI   71
Balance 0 (1,459)
Accumulated other comprehensive loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (10,344) (6,866)
Gains/(losses) recognized in OCI 6 59
Reclasses from OCI to net income 80 173
Net period OCI 86 232
Balance $ (10,258) $ (6,634)