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Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, plant and equipment      
Land $ 1,888 $ 2,010 $ 1,432
Building improvements 593,989 581,286 520,137
Machinery and equipment 379,912 360,199 246,584
Capitalized leases for machinery, equipment and buildings 22,445 35,129 76,244
Property, plant and equipment, gross 998,234 978,624 844,397
Accumulated depreciation and amortization (353,533) (313,067) (235,528)
Property Plant and Equipment Net before Construction in Progress 644,701 665,557 608,869
Construction in Progress 15,632 18,303 78,807
Property, plant and equipment, net $ 660,333 $ 683,860 $ 687,676