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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

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