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Amounts Recognized in AOCI (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, beginning balance $ (28,460) $ (5,130)  
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Pre tax amount 6,677 (37,477) 1,396
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Income tax effect (2,408) 14,483  
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Change, net of income tax 3,933 (23,330)  
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, ending balance (24,527) (28,460) (5,130)
Minimum Pension Liability, beginning balance (22,715) (15,009)  
Minimum Pension Liability, Pre tax amount 4,986 (12,397)  
Minimum pension liability, income tax effect 1,898 4,691 281
Minimum Pension Liability, Change, net of income tax 3,088 (7,706)  
Minimum Pension Liability, ending balance (19,627) (22,715) (15,009)
Total AOCI, beginning balance (51,175) (20,139)  
Total AOCI, Pre tax amount 11,327 (50,210) 1,803
Total AOCI, Income tax effect (4,306) 19,174 (689)
Total AOCI, Change, net of income tax 7,021 (31,036) 1,114
Total AOCI, ending balance $ (44,154) $ (51,175) $ (20,139)