Certain Information Regarding Health and Welfare Plan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in Plan Assets:
Fair value of assets at end of year	$ 150,671
Post-Retirement Benefits
Change in Benefit Obligation:
Benefit obligation at beginning of year	15,998	15,766
Service cost	5	4	4
Interest cost	720	793	910
Actuarial loss	1,291	1,283
Premiums/claims paid	(859)	(1,848)
Benefit obligation at end of year	17,155	15,998	15,766
Change in Plan Assets:
Fair value of assets at beginning of year
Employer contribution	859	1,848
Premiums/claims paid	(859)	(1,848)
Fair value of assets at end of year
Funded status (included in other liabilities)	(17,155)	(15,998)
Changes recognized in other comprehensive income for the year ended December 31:
Amortization of prior service cost	249	249
Amortization of actuarial gain	(411)	(313)
Net loss arising during the year	1,292	1,283
Total recognized in other comprehensive loss for the year (pre-tax)	1,130	1,219
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:
Prior service cost	(2,529)	(2,778)
Actuarial loss (net)	7,477	6,596
Total accumulated other comprehensive loss (pre-tax)	$ 4,948	$ 3,818

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Pretax change in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan, that has not been recognized in net periodic benefit cost.

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