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Changes in Cumulative Other Comprehensive Loss by Component - Changes in Cumulative Other Comprehensive Loss by Component (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 06, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]          
Beginning balance, Cumulative Currency Translation Adjustment   $ 36,153   $ 44,135  
Other comprehensive income (loss) before reclassifications, Cumulative Currency Translation Adjustment   3,296   (4,686)  
Amount reclassified from accumulated other comprehensive loss, Cumulative Currency Translation Adjustment           
Net current-period other comprehensive income (loss), Cumulative Currency Translation Adjustment   3,296   (4,686)  
Ending balance, Cumulative Currency Translation Adjustment   39,449   39,449  
Beginning balance, Changes in the Fair Value of Derivatives   1,815   427  
Other comprehensive income (loss) before reclassifications, Changes in the Fair Value of Derivatives   2,028   3,069  
Amount reclassified from accumulated other comprehensive loss, Changes in the Fair Value of Derivatives   (565)   (218)  
Net current-period other comprehensive income (loss), Changes in the Fair Value of Derivatives   1,463   2,851  
Ending balance, Changes in the Fair Value of Derivatives   3,278   3,278  
Beginning balance, Unrecognized Postretirement Benefit Plans   (582,165)   (596,088)  
Other comprehensive income (loss) before reclassifications, Unrecognized Postretirement Benefit Plans   (392)   5,783  
Amount reclassified from accumulated other comprehensive loss, Unrecognized Postretirement Benefit Plans 7,707 7,750   15,498  
Postretirement benefit plans, net of tax   7,358 10,141 21,281 14,998
Ending balance, Unrecognized Postretirement Benefit Plans   (574,807)   (574,807)  
Beginning balance, Total   (544,197)   (551,526)  
Other comprehensive income (loss) before reclassifications, Total   4,932   4,166  
Amount reclassified from accumulated other comprehensive loss, Total   7,185   15,280  
Net current-period other comprehensive income (loss), Total   12,117   19,446  
Ending balance, Total   $ (532,080)   $ (532,080)