XML 118 R210.htm IDEA: XBRL DOCUMENT

Changes in level 3 assets measured at fair value (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets at end of year	$ 656,131	$ 579,523
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets at beginning of year	2,511	2,491
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(223)	101
Defined Benefit Plan, Purchases, Sales, and Settlements	(154)	(81)
Fair value of plan assets at end of year	2,134	2,511
Private Equity Investment [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Fair value of plan assets at beginning of year	937	836
Defined Benefit Plan, Actual Return on Plan Assets Still Held	(223)	101
Fair value of plan assets at end of year	$ 714	$ 937

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.

+ References+ Details