Future Minimum Payments under Service Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]
2012	$ 9,252
2013	3,161
2014	2,276
2015	2,035
2016	1,589
Thereafter	628
Contractual Commitments Future Minimum Payments Due, Total	$ 18,941

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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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