Schedule of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2014
|
Mar. 31, 2013
|
---|---|---|
Property, Plant and Equipment [Line Items] | ||
Property, Plant and Equipment, Gross | $ 1,660,975 | $ 1,599,992 |
Accumulated Depreciation | (676,924) | (614,268) |
Property, Plant and Equipment, Net | 984,051 | 985,724 |
Land And Quarries [Member]
|
||
Property, Plant and Equipment [Line Items] | ||
Property, Plant and Equipment, Gross | 171,987 | 154,710 |
Plants [Member]
|
||
Property, Plant and Equipment [Line Items] | ||
Property, Plant and Equipment, Gross | 1,357,594 | 1,324,489 |
Buildings Machinery And Equipment [Member]
|
||
Property, Plant and Equipment [Line Items] | ||
Property, Plant and Equipment, Gross | 111,263 | 110,138 |
Construction in Progress [Member]
|
||
Property, Plant and Equipment [Line Items] | ||
Property, Plant and Equipment, Gross | $ 20,131 | $ 10,655 |