Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Original maturity period to consider all highly liquid investments purchased as cash equivalents.	90 days or less
Inventory written down description	Inventory is also written down when inventory levels are in excess of the forecasted demand for the next 12 months, as judged by management, for each specific product.
Cash flow hedge effectiveness assessment and measurement description	The Company would discontinue hedge accounting prospectively when it is determined that the cash flow hedge is not highly effective, the derivative expires or is sold, terminated or exercised, or it is unlikely that the forecasted transaction will occur in the initial identified time period or within a subsequent two-month time period
Percentage of trade receivables accounted for by an individual customer	35.60%	36.60%
Warranty period for finished goods against defects in material and workmanship under normal use and service	The Company warrants finished goods against defects in material and workmanship under normal use and service generally for periods of one to three years.
Percentage likelihood of realization to recognize income tax positions	50.00%