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Employee Retirement Plans - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended													3 Months Ended
	Dec. 31, 2010 Person	Mar. 31, 2014 Person	Mar. 31, 2014 Retirement Contributions Y	Mar. 31, 2014 Retirement Contributions Minimum	Mar. 31, 2014 Retirement Contributions Maximum	Mar. 31, 2014 Defined Contribution Pension Plan 401k Y	Mar. 31, 2014 Non-Qualified Supplemental Savings Plan Executives	Mar. 31, 2014 Non-Qualified Supplemental Savings Plan Executives Minimum	Mar. 31, 2014 Non-Qualified Supplemental Savings Plan Executives Maximum	Mar. 31, 2014 Multinational Pension Savings Plan Y	Mar. 31, 2013 Pension Plans, Defined Benefit	Mar. 31, 2012 Pension Plans, Defined Benefit	Mar. 31, 2014 Supplemental Executive Retirement Plan	Mar. 31, 2013 Supplemental Executive Retirement Plan	Dec. 31, 2012 Chief Executive Officer
Defined Benefit Plan Disclosure [Line Items]
Number of employers participated in defined benefit plan	60
Number of employers still remains in defined benefit plan		48
Defined benefit plan, employer contributions											$ 0	$ 0	$ 0	$ 0
Distribution in settlement of plan obligation															13,000,000
Settlement loss recognized															5,200,000
Percentage of defined benefit plan, actuarial discount rate assumption		4.75%
Defined benefit plan, significant concentrations of risk		The pension plan and the supplemental plan assets are periodically evaluated for concentration risks. As of March 31, 2014, the company did not have any individual asset investments that comprised 10% or more of each plan's overall assets.
Defined benefit plan, concentration risk, assets, debt securities, maximum single issuer		5.00%
Defined benefit plan, concentration risk, assets, debt securities, maximum value single issuer		$ 2,500,000
Defined benefit plan, concentration risk, assets, equity securities, difference plan assets and liabilities		15.00%
Defined benefit plan, concentration risk, assets, equity securities, maximum single investment		5.00%
Defined benefit plan, concentration risk, assets, equity securities, maximum foreign and us stock		10.00%
Defined benefit plan, concentration risk, diversification, equity limit, single industry		25.00%
Defined benefit plan, concentration risk, diversification, equity limit, single corporation		10.00%
Defined benefit plan, concentration risk, diversification, debt limit, single issuer		10.00%
Defined contribution plan, company contribution percentage			3.00%
Defined contribution plan, company contribution percentage additional percentage				1.00%	8.00%			1.00%	8.00%
Defined contribution plan, company contribution, vesting period, years			5			5				6
Percentage of defined plan, minimum employee contribution						2.00%				1.00%
Percentage of defined plan, maximum employee contribution						75.00%				15.00%
Defined contribution plan, company contribution percentage match, common stock						50.00%
Defined contribution plan, company contribution percentage match, common stock						8.00%	50.00%
Deferred compensation arrangement with individual, deferred compensation percentage							50.00%
Deferred compensation arrangement with individual, deferred bonus percentage							100.00%
Defined contribution plan, restoration benefit							3.00%
Percentage of defined plan, company contribution match, cash										50.00%
Percentage of defined plan, company contribution match, employee deferred compensation										6.00%

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