Acquisition (Acquisition-date Fair Value of Consideration) (Detail) $ in Thousands	Jan. 13, 2015 USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash	$ 50,485
Contingent consideration	(5,000)	[1]
Total net consideration transferred	$ 45,485

[1] The contingent consideration entitles the Company to receive a rebate of the premium paid for account attrition that occurs during the eighteen-month period beginning on January 13, 2015, the closing date of the transaction.