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Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance,	$ 1,965,786	$ 2,078,980	$ 1,985,094
Other comprehensive (loss) income before reclassifications, net of tax of $0, $(1,667)	(11,125)	(11,834)
Amounts reclassified from accumulated other comprehensive income, net of tax of $(255), $(190)	(945)	(999)
Other comprehensive (loss) income	(12,070)	(12,833)	689
Balance,	1,828,659	1,965,786	2,078,980
Foreign currency translation reclassification adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance,	(8,759)
Other comprehensive (loss) income before reclassifications, net of tax of $0, $(1,667)	(13,162)	(8,759)
Other comprehensive (loss) income	(13,162)	(8,759)
Balance,	(21,921)	(8,759)
Unrealized Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance,	(1,414)	2,365
Other comprehensive (loss) income before reclassifications, net of tax of $0, $(1,667)	2,037	(3,075)
Amounts reclassified from accumulated other comprehensive income, net of tax of $(255), $(190)	(683)	(704)
Other comprehensive (loss) income	1,354	(3,779)
Balance,	(60)	(1,414)	2,365
Amortization of prior service credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance,	2,029	2,324
Other comprehensive (loss) income before reclassifications, net of tax of $0, $(1,667)	59
Amounts reclassified from accumulated other comprehensive income, net of tax of $(255), $(190)	(321)	(295)	(295)
Other comprehensive (loss) income	(262)	(295)
Balance,	1,767	2,029	2,324
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance,	(8,144)	4,689	4,000
Amounts reclassified from accumulated other comprehensive income, net of tax of $(255), $(190)	(945)	(999)	(1,728)
Balance,	$ (20,214)	$ (8,144)	$ 4,689

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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