Accumulated Other Comprehensive Loss - Net Change and Ending Balances for Various Components of Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (82,375)	$ (79,290)	$ (59,474)
Net Change	36,510	(3,085)	(19,816)
Ending balance	(45,865)	(82,375)	(79,290)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,543)	(4,736)	(5,389)
Net Change	1,820	3,193	653
Ending balance	277	(1,543)	(4,736)
Unrecognized Components of Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(81,783)	(75,225)	(55,861)
Net Change	34,321	(6,558)	(19,364)
Ending balance	(47,462)	(81,783)	(75,225)
Unrealized Holding Gains (Losses) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	633	562	577
Net Change	374	71	(15)
Ending balance	1,007	633	562
Realized Gains/Losses from Settlement of Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	318	109	1,199
Net Change	(5)	209	(1,090)
Ending balance	$ 313	$ 318	$ 109