Goodwill and Intangibles - Carrying Amount of Goodwill by Reportable Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 133,716	$ 136,406	$ 137,000
Foreign exchange translation	(474)	97	(594)
Impairment charges		(2,787)
Goodwill, Ending Balance	133,242	133,716	136,406
North America [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	115,420	115,298	115,384
Foreign exchange translation	(101)	122	(86)
Goodwill, Ending Balance	115,319	115,420	115,298
Europe [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	13,836	13,596	13,926
Foreign exchange translation	(384)	240	(330)
Goodwill, Ending Balance	13,452	13,836	13,596
South America [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		3,102	3,480
Foreign exchange translation		(315)	(378)
Impairment charges		(2,787)
Goodwill, Ending Balance			3,102
Asia Pacific [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	4,460	4,410	4,210
Foreign exchange translation	11	50	200
Goodwill, Ending Balance	$ 4,471	$ 4,460	$ 4,410

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details

- Definition

The increase (decrease) in the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

+ References

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