Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Marketable securities	$ 47,833	$ 68,464
Liabilities:
Foreign exchange contracts	64	16
Contingent consideration	3,603
Certificates of deposits
Assets:
Marketable securities	1,975
Corporate bonds
Assets:
Marketable securities	45,858	68,464
Level II
Liabilities:
Foreign exchange contracts	64	16
Level II | Certificates of deposits
Assets:
Marketable securities	1,975
Level II | Corporate bonds
Assets:
Marketable securities	45,858	68,464
Level III
Liabilities:
Contingent consideration	$ 3,603