Segment Information (Net Sales by Geographic Area) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 535,829	$ 397,969	$ 378,924
Long-Lived Assets	118,680	80,325	78,008
United States [Member]
Segment Reporting Information [Line Items]
Net sales	345,864	269,989	251,695
Long-Lived Assets	72,832	48,787	45,979
France [Member]
Segment Reporting Information [Line Items]
Net sales	52,534	47,831	52,517
Long-Lived Assets	13,861	16,436	17,463
Germany [Member]
Segment Reporting Information [Line Items]
Net sales	77,896	77,229	71,896
Long-Lived Assets	12,366	13,287	13,542
UNITED KINGDOM
Segment Reporting Information [Line Items]
Net sales	26,387	0	0
Long-Lived Assets	7,601	0	0
CHINA
Segment Reporting Information [Line Items]
Net sales	29,401	0	0
Long-Lived Assets	11,225	0	0
Others [Member]
Segment Reporting Information [Line Items]
Net sales	3,747	2,920	2,816
Long-Lived Assets	$ 795	$ 1,815	$ 1,024