Marketable Investments - Summary of Maturity Periods of the Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
FY 2014	$ 29,153
FY2015	30,895
FY2016	20,965
Total	81,013	143,846
Federal Agency and Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
FY 2014	24,390
FY2015	28,844
FY2016	20,965
Total	74,199	116,004
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
FY 2014	4,763
FY2015	2,051
FY2016
Total	$ 6,814	$ 18,872