Acquisition (Acquisition-date Fair Value of Consideration) (Detail) - Jan. 13, 2015 - USD ($) $ in Thousands		Total
Business Combinations [Abstract]
Effective date of acquisition		Jan. 13, 2015
Cash		$ 50,485
Contingent consideration	[1]	(5,000)
Total net consideration transferred		$ 45,485

[1] The contingent consideration arrangement entitles the Company to receive a rebate of the purchase price relating to the premium paid for account attrition.