Noncontrolling Interests - Summary of Redeemable Noncontrolling Interests (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Mandatorily Redeemable Noncontrolling Interests
Redeemable noncontrolling interests, beginning balance	$ 11,615
Redemption value change	969	$ 1,300
Purchase of noncontrolling interests	(216)	(3,730)
Distributions to noncontrolling interests	(983)	(1,166)
Redeemable noncontrolling interests, ending balance	10,558
Mandatorily Redeemable Noncontrolling Interests
Summary of redeemable noncontrolling interests
Noncontrolling interest expense, Income Statement Impact	810	827
Redemption value change, Income Statement Impact	(23)	16
Mandatorily Redeemable Noncontrolling Interests
Redeemable noncontrolling interests, beginning balance	10,379	8,588
Redemption value change	787	843
Sale of noncontrolling interests	(363)
Distributions to noncontrolling interests	(677)	(761)
Currency translation adjustment	87	168
Redeemable noncontrolling interests, ending balance	10,213	8,838
Redeemable Noncontrolling Interests
Summary of redeemable noncontrolling interests
Noncontrolling interest expense, Income Statement Impact	784	820
Redemption value change, Income Statement Impact	185	480
Mandatorily Redeemable Noncontrolling Interests
Redeemable noncontrolling interests, beginning balance	11,615	11,511
Redemption value change	969	1,300
Purchase of noncontrolling interests	(1,185)
Distributions to noncontrolling interests	(793)	(758)
Other	(48)
Redeemable noncontrolling interests, ending balance	$ 10,558	$ 12,053

Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph 15
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

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- Definition

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to noncontrolling interests.

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- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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- Definition

Noncontrolling Interest, Decrease From Sale of Noncontrolling Interests

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Noncontrolling Interests, Decrease Related to Other Activity

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Noncontrolling Interests [Roll Forward]

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Redeemable noncontrolling interest attributable net income loss.

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