Acquisitions (Details Textual)		3 Months Ended		12 Months Ended
	Jul. 01, 2016 USD ($) shares	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Apr. 01, 2016
Business Acquisition [Line Items]
Adjustments to deferred acquisition consideration included in share-based compensation		$ 3,268	$ 2,906
Number of Businesses Acquired		0
Business Acquisition, Pro Forma Net Income (Loss)		$ (10,566,000)	(23,632,000)
Redeemable Noncontrolling Interest, Equity, Fair Value		$ 60,383,000		$ 60,180,000
Noncontrolling Interest, Ownership Percentage by Parent		100.00%
Business Combination, Contingent Consideration, Liability		$ 235,370,000		229,564,000
Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 36,698
Goodwill, Acquired During Period	$ 24,778
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years 9 months
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value	$ 2,275
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	5,514
Business Acquisition, Goodwill, Expected Tax Deductible Amount	0
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Intangible Assets	$ 8,074
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred	$ 49,837
Business Combination, Contingent Consideration, Liability	15,618				$ 18,857
Luntz Global Partners L L C
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired						40.00%
Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid				1,581
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value				1,005
Business Combinations, Assets Relinquished by Acquirer				428
Business Combinations, Liabilities Relinquished Previously due to Acquiree				94
Minimum [Member] | Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	35,000
Maximum [Member] | Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 55,000
Noncontrolling Interest [Member]
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Net Income (Loss)		0
Additional Paid-in Capital [Member] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests				22,775
Contingent payment [Domain]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		11,431,000	$ 6,327,000
Contingent payment [Domain] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Deferred Stock-based Compensation, Discounted				2,393
Business Combination, Consideration Transferred				4,052,000
Fixed payments [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability		$ 4,300,000		4,810,000
Fixed payments [Member] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred				467
Noncontrolling Interest Equity [Domain] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests				$ 19,354
Common Class A [Member] | Common Stock [Member] | Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions | shares	1,900,000
Stock Issued During Period, Value, Acquisitions	$ 34,219,000