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Schedule of Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Change In Accounting Principle |  |  |
Actuarial losses, tax portion | $ 11,582 | $ 12,297 | $ 7,269
Originally Reported |  |  |
Change In Accounting Principle |  |  |
Defined benefit pension and post-retirement plans; Actuarial losses, tax portion |  | (3,427) | (1,826)
Defined benefit pension and post-retirement plans; Prior service costs, tax portion |  |  | 0
Actuarial losses, tax portion |  | 3,385 | 133
Prior service costs, tax portion |  | 9 | 0
Effect Of Accounting Change |  |  |
Change In Accounting Principle |  |  |
Defined benefit pension and post-retirement plans; Actuarial losses, tax portion |  | 3,427 | 1,826
Actuarial losses, tax portion |  | (3,385) | (133)
As Adjusted |  |  |
Change In Accounting Principle |  |  |
Defined benefit pension and post-retirement plans; Prior service costs, tax portion |  |  | 0
Prior service costs, tax portion |  | $ 9 | $ 0

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