Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Accrued Liabilities [Line Items]
Accrued earnouts	$ 9,840	$ 5,534
Salaries and benefits	8,810	5,432
Real estate and property taxes	9,580	5,557
Other	13,822	7,223
Total accrued expenses	$ 42,052	$ 23,746