Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Commitments and Contingencies [Line Items]
Commitments and contingencies
Commitment To Purchase Property, Plant and Equipment
Commitments and Contingencies [Line Items]
Commitments and contingencies	4,772	3,965
Outstanding Bank Guarantees
Commitments and Contingencies [Line Items]
Commitments and contingencies	$ 11,083	$ 13,381

- Definition

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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