Amounts Recognized in AOCI (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, beginning balance	$ (14,170)	$ (24,527)
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Pre tax amount	17,332	16,627
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Income tax effect	(6,409)	(6,270)
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, Change, net of income tax	10,923	10,357
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges, ending balance	(3,247)	(14,170)	(24,527)
Foreign Currency Translation Adjustment, beginning balance	0	0
Foreign Currency Translation Adjustment, Pretax amount	(2,431)	0	0
Foreign Currency Translation Adjustment, Income tax effect	0	0
Foreign Currency Translation Adjustment, Change, net of income tax	(2,431)	0
Foreign Currency Translation Adjustment, ending balance	(2,431)	0	0
Minimum Pension Liability, beginning balance	(10,640)	(19,627)
Minimum Pension Liability, Pre tax amount	(14,270)	14,657
Minimum pension liability, income tax effect	5,356	5,670	1,898
Minimum Pension Liability, Change, net of income tax	(8,914)	8,987
Minimum Pension Liability, ending balance	(19,554)	(10,640)	(19,627)
Total AOCI, beginning balance	(24,810)	(44,154)
Total AOCI, Pre tax amount	631	31,284	11,327
Total AOCI, Income tax effect	(1,053)	(11,940)	(4,306)
Total AOCI, Change, net of income tax	(422)	19,344	7,021
Total AOCI, ending balance	$ (25,232)	$ (24,810)	$ (44,154)