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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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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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