Basis of Presentation and Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (122,742)		$ (100,697)		$ (140,131)		$ (94,413)
Other comprehensive income (loss) before reclassification	(467)		(62,257)		11,547		(70,092)
Amounts reclassified from AOCI	3,988		6,281		9,363		7,832
Other comprehensive income, net of tax including minority interest effect	3,521		(55,976)		20,910		(62,260)
Other comprehensive income (loss), net of tax	3,524	[1]	(55,991)	[1]	20,880	[1]	(62,287)	[1]
Ending Balance	(119,221)		(156,673)		(119,221)		(156,673)
Foreign currency gain (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,882)		3,848		(2,562)		(3,366)
Other comprehensive income (loss) before reclassification	(939)		(6,734)		(1,259)		480
Amounts reclassified from AOCI	0				0
Other comprehensive income (loss), net of tax	(939)		(6,734)		(1,259)		480
Ending Balance	(3,821)		(2,886)		(3,821)		(2,886)
Unrealized holding loss on investment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	214		(1,915)		238		(2,316)
Other comprehensive income (loss) before reclassification	31		40		7		441
Amounts reclassified from AOCI	0				0
Other comprehensive income (loss), net of tax	31		40		7		441
Ending Balance	245		(1,875)		245		(1,875)
Deferred gain (loss) on derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(30,824)		(5,819)		(45,386)		11,735
Other comprehensive income (loss) before reclassification	441		(55,563)		12,799		(71,013)
Amounts reclassified from AOCI	293		3,066		2,497		962
Other comprehensive income (loss), net of tax	734		(52,497)		15,296		(70,051)
Ending Balance	(30,090)		(58,316)		(30,090)		(58,316)
Defined benefit pension plans loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(89,250)		(96,811)		(92,421)		(100,466)
Other comprehensive income (loss) before reclassification	0				0
Amounts reclassified from AOCI	3,695		3,215		6,866		6,870
Other comprehensive income (loss), net of tax	3,695		3,215		6,866		6,870
Ending Balance	$ (85,555)		$ (93,596)		$ (85,555)		$ (93,596)

[1] The tax impacts on amounts presented in other comprehensive income are not significant.