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Employer Contributions, Participant Contributions and Benefit Payments (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans
Defined Contribution Plan Disclosure [Line Items]
Employer Contributions	$ 4,191,000	$ 3,700,000	$ 9,387,000
Benefit Payments	4,246,000	3,764,000	4,456,000
Other Postretirement Benefit Plans, Defined Benefit
Defined Contribution Plan Disclosure [Line Items]
Employer Contributions	3,650,000	3,280,000	2,190,000
Participant Contributions	59,000	36,000	18,000
Benefit Payments	2,184,000	1,942,000	2,083,000
Supplemental Employee Retirement Plans, Defined Benefit
Defined Contribution Plan Disclosure [Line Items]
Employer Contributions	53,000	53,000	53,000
Benefit Payments	$ 53,000	$ 53,000	$ 53,000

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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