Employee Benefit Plans - Changes in Benefit Obligation (Detail) (Pension Benefits [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits [Member]
Changes in benefit obligation
Benefit obligation at beginning of year	$ 2,165,692,000	$ 1,958,399,000
Service cost	19,083,000	15,254,000	13,039,000
Interest cost	89,408,000	100,338,000	97,293,000
Plan participants' contributions	3,543,000	3,962,000
Plan amendments		(4,217,000)
Actuarial (gain) loss	(164,784,000)	330,028,000
Foreign currency exchange rate changes	(13,893,000)	5,489,000
Gross benefits paid	(73,186,000)	(67,767,000)
Acquired plan	9,322,000
Curtailments		(175,794,000)
Benefit obligation at end of year	$ 2,035,185,000	$ 2,165,692,000	$ 1,958,399,000