Fair Value Measurement - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Aug. 27, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial assets, fair value	$ 0	$ 0
Financial liabilities, fair value	0	0
Carrying value	99,291,000	90,775,000
Changes to fair value of assets, realized	0	0
DEG Vietnam Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	15,000,000		$ 15,000,000
Fair value	15,269,000
DEG China Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	3,574,000	4,805,000
Fair value	$ 3,666,000	$ 4,937,000