Goodwill and Intangible Assets - Summary of Activity Related to Goodwill (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill, Gross [Roll Forward]
Goodwill, Gross Carrying Amount Beginning Balance	$ 265,994
Acquisition	0
Goodwill, Gross Carrying Amount Ending Balance	265,994
Accumulated Impairment Losses [Roll Forward]
Goodwill, Accumulated Impairment Losses Beginning Balance	(39,960)
Goodwill, Accumulated Impairment Losses Ending Balance	(39,960)
Goodwill [Roll Forward]
Goodwill, Net Carrying Amount Beginning Balance	226,034
Acquisition	0
Goodwill, Net Carrying Amount Ending Balance	$ 226,034