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Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 3,701,074 | $ 3,388,633 | $ 3,203,050
Ending Balance | 4,089,293 | 3,701,074 | 3,388,633
Total [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (14,891) | (28,298) | (17,189)
Other comprehensive income (loss) | 4,288 | 13,407 | (11,109)
Ending Balance | (10,603) | (14,891) | (28,298)
Qualifying Cash Flow Hedging Instruments [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (419) | (468) | 17
Other comprehensive income (loss) | 378 | 49 | (485)
Ending Balance | (41) | (419) | (468)
Pension Adjustments [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (15,850) | (29,888) | (18,919)
Other comprehensive income (loss) | 3,690 | 14,038 | (10,969)
Ending Balance | (12,160) | (15,850) | (29,888)
Unrealized (Loss) Gain on Available for Sale Marketable Securities [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (463) | 0 | (171)
Other comprehensive income (loss) | 47 | (463) | 171
Ending Balance | (416) | (463) | 0
Foreign Exchange Gain (Loss) on Currency Translation [Member] |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 1,841 | 2,058 | 1,884
Other comprehensive income (loss) | 173 | (217) | 174
Ending Balance | $ 2,014 | $ 1,841 | $ 2,058

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details
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