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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Goodwill, Written off Related to Sale of Business Unit |  |  | $ 7,536 |
Goodwill, Gross |  | $ 1,085,420 | 1,082,540 | $ 1,095,731
Goodwill, Accumulated Impairment Loss |  | 784,053 | 784,053 | 678,342
Goodwill |  | 301,367 | 298,487 | 417,389
Goodwill, Translation Adjustments |  |  | (5,655) |
Goodwill, Period Increase (Decrease) |  | 2,880 | (13,191) |
Goodwill, Impairment Loss |  | 0 |  |
Industrial [Member] |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | 1,075 |
Goodwill, Gross |  | 410,694 | 408,705 | 414,298
Goodwill, Accumulated Impairment Loss |  | (137,204) | (137,204) | (137,204)
Goodwill |  | 273,490 | 271,501 | 277,094
Goodwill, Translation Adjustments |  |  | (4,518) |
Goodwill, Period Increase (Decrease) |  | 1,989 | (5,593) |
Infrastructure [Member] |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | 6,461 |
Goodwill and Intangible Asset Impairment | $ 106,100 |  |  |
Goodwill, Gross |  | 633,211 | 633,211 | 640,360
Goodwill, Accumulated Impairment Loss |  | (633,211) | (633,211) | (527,500)
Goodwill |  | 0 | 0 | 112,860
Goodwill, Translation Adjustments |  |  | (688) |
Goodwill, Period Increase (Decrease) |  | $ 0 | (7,149) |
Goodwill, Impairment Loss | (105,700) |  | $ 105,711 |
March Charges [Member] | Infrastructure [Member] |  |  |  |
Goodwill and Intangible Asset Impairment |  |  |  | 152,900
Goodwill, Impairment Loss |  |  |  | (152,500)
December Charges [Member] | Infrastructure [Member] |  |  |  |
Goodwill and Intangible Asset Impairment |  |  |  | 376,500
Goodwill, Impairment Loss |  |  |  | (375,000)
Trademarks [Member] | Industrial [Member] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | 2,300 |  |  |
Trademarks [Member] | Infrastructure [Member] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ 400 |  |  |
Trademarks [Member] | March Charges [Member] | Infrastructure [Member] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | 400
Trademarks [Member] | Charge Associated with Finalization [Member] | Infrastructure [Member] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | 6,800
Trademarks [Member] | December Charges [Member] | Infrastructure [Member] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | $ 1,500

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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