Goodwill and Other Intangibles - Schedule of Changes in the Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill gross, Beginning Balance	$ 82,817	$ 46,327
Goodwill gross, Additions	29,800	36,490
Goodwill gross, Impairments
Goodwill gross, Ending Balance	112,617	82,817
Accumulated impairment losses, Beginning Balance	(38,240)	(38,240)
Accumulated impairment losses, Additions
Accumulated impairment losses Impairments
Accumulated impairment losses, Ending Balance	(38,240)	(38,240)
Goodwill Net, Beginning balance	44,577	8,087
Goodwill Net, Additions	29,800	36,490
Goodwill Net, Impairments
Goodwill Net, Ending balance	$ 74,377	$ 44,577