Employee Retirement Plans - Additional Information (Detail) NOK in Millions					1 Months Ended	12 Months Ended
	Jan. 02, 2016	Dec. 31, 2015	Dec. 01, 2015 USD ($)	Nov. 30, 2015	Dec. 31, 2010 Person	Mar. 31, 2016 USD ($) Person	Mar. 31, 2016 NOK Person	Mar. 31, 2015 USD ($)	Mar. 31, 2015 NOK
Defined Benefit Plan Disclosure [Line Items]
Number of employers participated in defined benefit plan | Person					60
Number of employers still remains in defined benefit plan | Person						37	37
Percentage of defined benefit plan, actuarial discount rate assumption						4.15%	4.15%
Defined benefit plan, significant concentrations of risk						U.S. Plans The pension plan and the supplemental plan assets are periodically evaluated for concentration risks. As of March 31, 2016, the company did not have any individual asset investments that comprised 10% or more of each plan’s overall assets.	U.S. Plans The pension plan and the supplemental plan assets are periodically evaluated for concentration risks. As of March 31, 2016, 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, equity securities, difference plan assets and liabilities						15.00%	15.00%
Defined benefit plan, concentration risk, assets, equity securities, maximum foreign and us stock						10.00%	10.00%
Defined benefit plan, concentration risk, diversification, equity limit, single industry						25.00%	25.00%
Defined benefit plan, concentration risk, diversification, equity limit, single corporation						10.00%	10.00%
Defined benefit plan, concentration risk, diversification, debt limit, single issuer						10.00%	10.00%
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions						$ 0		$ 0
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions						200,000		0
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Additional estimated net periodic benefit						$ 1,400,000
Retirement Contributions
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, company contribution percentage						3.00%	3.00%
Defined contribution plan, company contribution, vesting period, years						5 years	5 years
Retirement Contributions | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, company contribution percentage additional percentage						1.00%	1.00%
Retirement Contributions | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, company contribution percentage additional percentage						8.00%	8.00%
Defined Contribution Savings Plan 401k
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, company contribution, vesting period, years						5 years	5 years
Percentage of defined plan, minimum employee contribution						2.00%	2.00%
Percentage of defined plan, maximum employee contribution						75.00%	75.00%
Percentage of defined plan, company contribution match, cash	50.00%
Percentage of defined plan, company contribution match, employee deferred compensation	8.00%	8.00%
Defined contribution plan, company contribution percentage match, company stock		50.00%
Non-Qualified Supplemental Savings Plan Executives
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, company contribution percentage match, common stock						50.00%	50.00%
Deferred compensation arrangement with individual, deferred compensation percentage						50.00%	50.00%
Deferred compensation arrangement with individual, deferred bonus percentage						100.00%	100.00%
Defined contribution plan, restoration benefit						3.00%	3.00%
Non-Qualified Supplemental Savings Plan Executives | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, company contribution percentage additional percentage						1.00%	1.00%
Non-Qualified Supplemental Savings Plan Executives | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, company contribution percentage additional percentage						8.00%	8.00%
Multinational Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, company contribution, vesting period, years			5 years	6 years
Percentage of defined plan, minimum employee contribution			1.00%	1.00%
Percentage of defined plan, maximum employee contribution			50.00%	15.00%
Percentage of defined plan, company contribution match, cash			50.00%	50.00%
Percentage of defined plan, company contribution match, employee deferred compensation			6.00%	6.00%
Reduction in defined plan assets and liabilities			$ 6,400,000
Norway’s Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Number of employers still remains in defined benefit plan | Person						146	146
Defined benefit plan, employer contributions						$ 500,000	NOK 3.8	$ 600,000	NOK 4.8