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Reconciliation of United States Statutory Federal Rate to Income Tax Provision (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 5 Months Ended 7 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
May 31, 2010
Predecessor
Dec. 31, 2010
Successor
Dec. 31, 2012
Successor
Dec. 31, 2011
Successor
Schedule Of Income Tax Reconciliation [Line Items]            
Tax at U.S. statutory rate     $ 111,984 $ 16,177 $ 23,550 $ 34,042
State and local taxes     7,899 1,606 1,469 860
Tax credits     (1,936) (4,179) (2,875) (4,464)
Reorganization items and fresh- start accounting adjustments, net     (37,761)      
US-Canada APA settlement     5,867 (651)   2,658
Foreign withholding taxes     789 1,823 242 2,290
Effect of foreign tax rates     (7,376) (3,788) (6,147) (7,739)
Tax audits & assessments     (258) 1,635 2,541 260
Valuation allowance     (38,915) (5,377) (57,652) (10,839)
Other, net     (353) (2,151) 7,341 3,697
Income tax provision $ 7,891 $ 8,062 $ 39,940 $ 5,095 $ (31,531) $ 20,765
Effective income tax rate 28.00% 25.00% 12.50% 11.00% (46.90%) 21.30%