Stockholders' Equity - Adjustments for Items Reclassified Out of AOCI (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Less - related income taxes	$ 21,751	$ 3,948
Net of tax	1,282	1,464
Total reclassifications, net of tax	1,289	1,482
Interest Rate Hedge [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax		264
Employee Benefit Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization relating to employee benefit plans	1,821	1,620
Less - related income taxes	532	402
Net of tax	$ 1,289	$ 1,218