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Summary of Activities Relating to Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Intangible Assets And Goodwill [Line Items]    
Goodwill and intangible assets, Beginning Balance   $ 55,149
Impairment of trade names (3,384) (3,384)
Goodwill acquired   13,430
Intangibles acquired   45,181
Amortization   (4,736)
Goodwill and Intangible Assets, Ending Balance $ 105,640 $ 105,640