Sales Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	$ 323,767	$ 334,543	$ 635,423	$ 674,650
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	100,956	100,929	202,618	214,237
Germany
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	39,971	42,304	80,612	85,685
China
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	20,313	17,503	39,305	36,193
Japan
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	19,801	20,080	37,482	37,131
Thailand
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	10,936	10,182	27,184	20,164
Brazil
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	12,365	12,984	26,508	26,881
Belgium
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	17,100	12,432	25,286	23,114
France
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	11,531	11,361	24,010	23,195
United Kingdom
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	10,268	10,285	18,420	20,759
Italy
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	7,345	10,927	17,566	23,398
Netherlands
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	6,259	6,577	13,286	16,214
Malaysia
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	5,585	7,385	12,067	13,138
Sweden
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	6,496	5,499	10,921	9,572
Taiwan
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	6,102	3,493	10,669	9,939
Canada
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	4,631	4,919	8,664	9,679
Argentina
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	4,406	4,246	8,596	8,911
Mexico
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	4,463	4,809	8,210	9,683
South Korea
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	4,954	3,936	7,895	7,159
Turkey
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	3,245	5,914	6,552	11,590
Austria
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	3,635	4,344	6,450	6,070
Poland
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	2,905	2,385	4,596	3,811
All other countries
Segment Reporting Revenue Reconciling Item [Line Items]
Sales revenue	$ 20,500	$ 32,049	$ 38,526	$ 58,127