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Amounts Recognized in AOCI (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, beginning balance $ (24,527) $ (28,460)  
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Pre tax amount 16,627 6,341  
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Income tax effect (6,270) (2,408)  
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Change, net of income tax 10,357 3,933  
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, ending balance (14,170) (24,527) (28,460)
Minimum Pension Liability, beginning balance (19,627) (22,715)  
Minimum Pension Liability, Pre tax amount 14,657 4,986  
Minimum pension liability, income tax effect (5,670) (1,898) (4,691)
Minimum Pension Liability, Change, net of income tax 8,987 3,088  
Minimum Pension Liability, ending balance (10,640) (19,627) (22,715)
Total AOCI, beginning balance (44,154) (51,175)  
Total AOCI, Pre tax amount 31,284 11,327 (50,210)
Total AOCI, Income tax effect (11,940) (4,306) 19,174
Total AOCI, Change, net of income tax 19,344 7,021 (31,036)
Total AOCI, ending balance $ (24,810) $ (44,154) $ (51,175)