Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Goodwill And Intangible Assets [Line Items]
Amortization of intangibles assets	$ 2,293	$ 1,544	$ 4,594	$ 4,035
Goodwill impairment charges
Consolidated Subsidiaries
Goodwill And Intangible Assets [Line Items]
Goodwill impairment charges	0	0	0	0
Intangible assets impairment charges	$ 0	$ 0	$ 0	$ 0