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Unconsolidated Joint Venture - (Detail) € in Thousands, $ in Thousands	1 Months Ended							6 Months Ended
	May 31, 2017 EUR (€)	May 31, 2017 USD ($)	Jun. 30, 2016 EUR (€)	Feb. 28, 2015 EUR (€)	Feb. 28, 2015 USD ($)	Sep. 30, 2014 EUR (€)	Sep. 30, 2014 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jan. 31, 2015 EUR (€)	Jan. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Initial funding for equity method investment								$ 726	$ 362
KBCD Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Initial funding for equity method investment						€ 30,724	$ 39,477
Commitment to Invest in KBCD [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest						€ 38,000							$ 50,000
Unfunded Commitment, Champ L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest			€ 2,802							$ 2,985
Commitment to invest transfer | €			€ 427
Wholly-owned Subsidiary [Member] | Champ Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest						59.00%		0.00%					59.00%
Champ LP [Member] | KBC Bank Deutschland AG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest						35.00%							35.00%
Company and affiliated investors ownership, percentage								100.00%
Champ LP [Member]
Schedule of Equity Method Investments [Line Items]
Sale of equity method investment, percentage				48.00%	48.00%
Proceeds from sale of equity method investments	€ 21,792	$ 24,498		€ 16,314	$ 20,794
Foreign exchange adjustments included in accumulated other comprehensive loss					$ 2,614
Loss on sale of equity method investment		$ 3,305
Champ LP [Member] | Additional Investment [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest											€ 3,331	$ 3,929

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