Benefit Plans - Additional Information (Detail) (USD $) Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Decrease in pension plan obligations	$ (5,000,000)
Decrease in postretirement benefit plan obligations	(6,600,000)
Result of 50 basis point change in the expected long-term rate of return	500,000
Defined benefit plans in accumulated other comprehensive income expected to be recognized in 2014	1,200,000
Cash contributions to pension plans	17,500,000
Cash contributions to pension plans, voluntary contributions	13,000,000
Estimated cash contributions by employer in 2014	3,400,000
Projected health-care cost trend rate in 2014	7.60%
Ultimate health-care cost trend rate in 2029	4.50%
Year that rate reaches Ultimate health-care cost trend rate	2029
Equity Securities
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Asset mix of securities	60.00%
Debt Securities
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Asset mix of securities	40.00%
Pension Costs
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Amount of basis point change	0.50%
Cash contributions to pension plans	17,500,000	4,400,000
Deferred compensation funded status	(400,000)	(20,900,000)
Deferred Profit Sharing
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Amounts charged to earnings for defined contribution profit sharing plan	15,800,000	13,500,000	10,500,000
Defined Contribution Pension
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Amounts charged to earnings for defined contribution profit sharing plan	4,500,000	3,800,000	3,700,000
Percentage of employer matching	50.00%
Percentage of employee gross pay employer contributes 50%	6.00%
401 K Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer contribution description	The Company also has a domestic employee 401K savings plan. The Company matches 50% of each employee's contribution up to a maximum of 6% of the employee's earnings.
Employee Stock Purchase Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Discount rate on market price	15.00%
Stock purchase limit per employee	25,000
Employee stock purchase plan expenses	600,000	500,000	500,000
Deferred Compensation Plans
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Deferred compensation liability	83,500,000	73,000,000
Deferred compensation funded status	62,800,000	55,300,000
Amounts charged to earnings	$ 2,800,000	$ 2,600,000	$ 2,900,000
Shares held in rabbi trust	125
Deferred Compensation Plans | Management
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Eligible percentage of regular compensation, maximum	85.00%
Deferred Compensation Plans | Director
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Vesting percentage	100.00%