Short-Term Investments - Maturities of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 28, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Less than one year	$ 56,494	$ 55,278
Due in 1 - 2 years	22,053	24,974
Total short-term investments, Estimated Fair Value	$ 78,547	$ 80,252