Redeemable Non-Controlling Interests - Activities of Company's Redeemable Non-Controlling Interests (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Redeemable Noncontrolling Interest [Line Items]
Balance	$ 67,601
ALOG acquisition		66,777
Net income (loss) attributable to redeemable non-controlling interests	3,116	(1,394)
Other comprehensive loss attributable to redeemable non-controlling interests	(6,485)	(7,110)
Change in redemption value of non-controlling interests	21,270	11,476
Impact of foreign currency exchange	(1,324)	(2,148)
Balance	$ 84,178	$ 67,601

Amount of Net Income (Loss) attributable to noncontrolling interest.

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Amount after tax and reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency, which is attributable to noncontrolling interests.

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- Definition

As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form.

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-Appendix A

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