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Business Combination - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Baptist Leadership Group [Member]
Business Acquisition [Line Items]      
Acquisition date of assets of Baptist Leadership Group     Sep. 09, 2013
Consideration paid for acquisition in cash     $ 7,200,000
Consideration paid for acquisition in shares     15,230
Transaction-related costs     110,000
Purchase price allocation for goodwill 34,044,000 29,299,000 4,600,000
Purchase price allocation for identifiable intangible assets     3,200,000
Purchase price allocation for net tangible assets     334,000
Purchase price allocation for liabilities     $ 382,000
Preliminary purchase price allocation measurement period     1 year