Goodwill and Intangible Assets - Schedule of Changes in the Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill [Roll Forward]
Goodwill gross, Beginning Balance	$ 189,956
Goodwill gross, Additions	1,833
Goodwill gross, Impairments	0
Goodwill gross, Ending Balance	191,789
Accumulated impairment losses, Beginning Balance	(38,240)
Accumulated impairment losses, Additions	0
Accumulated impairment losses, Impairments	0
Accumulated impairment losses, Ending Balance	(38,240)
Goodwill Net, Beginning balance	151,716
Goodwill Net, Additions	1,833
Goodwill Net, Impairments	0
Goodwill Net, Ending balance	$ 153,549