Future Minimum Payments Under Service and Purchase Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
2012	$ 6,595
2013	5,231
2014	3,146
2015	2,505
2016	1,996
Thereafter	640
Contractual Commitments Future Minimum Payments Due, Total	$ 20,113

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Contractual Commitments Future Minimum Payments Due

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Contractual Commitments Future Minimum Payments Due Current

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Contractual Commitments Future Minimum Payments Due In Five Years

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Contractual Commitments Future Minimum Payments Due In Four Years

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Contractual Commitments Future Minimum Payments Due In Three Years

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Contractual Commitments Future Minimum Payments Due In Two Years

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Contractual Commitments Future Minimum Payments Due Thereafter

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