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Certain Information Regarding Health and Welfare Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in Plan Assets:
Fair value of assets at end of year	$ 211,888
Post-Retirement Benefits
Change in Benefit Obligation:
Benefit obligation at beginning of year	18,375	$ 18,322
Service cost	4	4	$ 4
Interest cost	700	759	683
Actuarial (gain) loss	(880)	238
Premiums and claims paid	(919)	(948)
Benefit obligation at end of year	17,280	18,375	18,322
Change in Plan Assets:
Fair value of assets at beginning of year	0	0
Employer contribution	919	948
Premiums and claims paid	(919)	(948)
Fair value of assets at end of year	0	0	$ 0
Funded status (included in "Other liabilities")	(17,280)	(18,375)
Changes recognized in other comprehensive (loss) income for the year ended December 31:
Amortization of prior service cost	249	249
Amortization of actuarial gain	(383)	(474)
Net actuarial (gain) loss arising during the year	(880)	238
Total recognized in other comprehensive loss for the year (pre-tax)	(1,014)	13
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:
Prior service cost	(1,533)	(1,782)
Actuarial loss, net	6,137	7,400
Total accumulated other comprehensive loss (pre-tax)	$ 4,604	$ 5,618

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Other Comprehensive Income, Amortization of Net Actuarial Gain (Loss), Before Tax

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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