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Net Benefit Cost of Pension and Postretirement Benefit Plans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 2,331 [1] $ 2,297 [1] $ 2,229 [1]
Interest cost 16,561 [1] 17,284 [1] 17,141 [1]
Expected return on plan assets (20,245) [1] (19,998) [1] (16,753) [1]
Net amortization and deferral 6,474 [1] 4,018 [1] 4,013 [1]
Curtailment gain (197) [1] (37) [1] (52) [1]
Settlement gain 106 [1] (5) [1] (40) [1]
Net benefit cost 5,030 [1] 3,559 [1] 6,538 [1]
Other Benefit
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 704 [1] 479 [1] 690 [1]
Interest cost 2,122 [1] 2,054 [1] 2,310 [1]
Net amortization and deferral 761 [1] (45) [1] 105 [1]
Net benefit cost $ 3,587 [1] $ 2,488 [1] $ 3,105 [1]
[1] All periods have been adjusted to remove amounts related to discontinued operations.