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Schedule of Other Long Term Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]    
Long-term portion of deferred rent $ 7,720 $ 950
Long-term portion of contingent acquisition consideration payable 29,369 33,059
Long-term portion of asset retirement obligation liability 3,406 [1] 2,991 [1]
Long-term portion of deferred compensation liability 13,134 8,768
Long-term income taxes payable 5,165 5,165
Deferred tax liabilities 32,698 35,127
Other 900 2,119
Total other long-term liabilities $ 92,392 $ 88,179 [2]
[1] At September 30, 2012 and December 31, 2011, the asset retirement obligation liability was included in other long-term liabilities.
[2] December 31, 2011 balances were derived from the audited consolidated financial statements.