Fair Value Measurements and Disclosures - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Assets
Marketable securities	$ 9,139	$ 9,333
Fair Value, Measurements, Recurring [Member]
Assets
Cash equivalents	50
Marketable securities	9,139	9,333
Interest rate swaps		392
Total Assets	9,189	9,725
Liabilities
Interest rate swaps	247
Total Liabilities	247
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets
Cash equivalents	50
Marketable securities	9,139	9,333
Total Assets	9,189	9,333
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets
Interest rate swaps		392
Total Assets		$ 392
Liabilities
Interest rate swaps	247
Total Liabilities	$ 247