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Unconsolidated Joint Venture - (Detail) € in Thousands, $ in Thousands	1 Months Ended							9 Months Ended
	May 31, 2017 USD ($)	May 31, 2017 EUR (€)	Jun. 30, 2016 EUR (€)	Feb. 28, 2015 USD ($)	Feb. 28, 2015 EUR (€)	Sep. 30, 2014 USD ($)	Sep. 30, 2014 EUR (€)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 EUR (€)	Jan. 31, 2015 USD ($)	Jan. 31, 2015 EUR (€)	Sep. 30, 2014 EUR (€)
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						$ 39,477	€ 30,724
Commitment to Invest in KBCD [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest						$ 50,000								€ 38,000
Unfunded Commitment, Champ L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest										$ 2,985	€ 2,802
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	$ 24,498	€ 21,792		$ 20,794	€ 16,314
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												$ 3,929	€ 3,331

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