Components of Accumulated Other Comprehensive Income (Loss) included in Stockholders' Equity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized holding loss on investment, Beginning balance	$ (2,316)	$ (4,402)
Other comprehensive income (loss) before reclassification	401	696
Amounts reclassified from AOCI
Net current period other comprehensive income (loss)	401	696
Unrealized holding loss on investment, Ending balance	(1,914)	(3,706)
Deferred gain (loss) on derivatives, Beginning balance	11,735	3,088
Other comprehensive income (loss) before reclassification	(15,450)	(5,887)
Amounts reclassified from AOCI	(2,104)	1,142
Net current period other comprehensive income (loss)	(17,554)	(4,745)
Deferred gain (loss) on derivatives, Ending balance	(5,820)	(1,657)
Foreign currency gain (loss), Beginning balance	(3,366)	(12,438)
Other comprehensive income (loss) before reclassification	7,214	3,113
Amounts reclassified from AOCI
Net current period other comprehensive income (loss)	7,214	3,113
Foreign currency gain (loss), Ending balance	3,848	(9,325)
Defined benefit pension plans, Beginning balance	(100,466)	(88,278)
Other comprehensive income (loss) before reclassification
Amounts reclassified from AOCI	3,655	3,045
Net current period other comprehensive income (loss)	3,655	3,045
Defined benefit pension plans, Ending balance	(96,811)	(85,233)
Accumulated other comprehensive income, Beginning balance	(94,413)	(102,030)
Other comprehensive income (loss) before reclassification	(7,835)	(2,078)
Amounts reclassified from AOCI	1,551	4,187
Net current period other comprehensive income (loss)	(6,284)	2,109
Accumulated other comprehensive income, Ending balance	$ (100,697)	$ (99,921)