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Commitments and Contingencies - Future Minimum Rental Commitments under Office and Equipment Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future Minimum Payments Under Non Cancelable Operating Leases With Initial Terms Of One Year Or More [Line Items]
2013	$ 41,595
2014	38,894
2015	33,473
2016	29,407
2017	25,849
2018 and thereafter	153,482
Total	$ 322,700

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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