Summary of Activity Related to Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Goodwill And Intangible Assets [Line Items]
Goodwill, Gross Carrying Amount Beginning Balance	$ 90,770
Change in goodwill, Gross Carrying Amount
Goodwill, Gross Carrying Amount Ending Balance	90,770
Goodwill, Accumulated Impairment Losses Beginning Balance	(304)
Goodwill accumulated impairment losses adjustment
Goodwill, Accumulated Impairment Losses Ending Balance	(304)
Goodwill, Net Carrying Amount Beginning Balance	90,466
Change in goodwill, Net Carrying Amount
Goodwill, Net Carrying Amount Ending Balance	$ 90,466