Equity-Based Compensation - Summary of Status of Stock Options (Detail) (USD $)	9 Months Ended
	Sep. 28, 2014
Summary of Status of Stock Options
Outstanding, Options at beginning of year	123,000
Exercised, Options	(115,100)
Expired, Options	(2,700)
Forfeited, Options
Outstanding, Options at end of period	5,200
Exercisable, Options at end of period	5,200
Outstanding, Weighted - Average Exercise Price at beginning of year	$ 12.78
Exercised, Weighted - Average Exercise Price	$ 12.84
Expired, Weighted - Average Exercise Price	$ 11.04
Forfeited, Weighted - Average Exercise Price
Outstanding, Weighted - Average Exercise Price at end of period	$ 12.35
Exercisable, Weighted - Average Exercise Price at end of period	$ 12.35
Stock Options [Member]
Summary of Status of Stock Options
Intrinsic values of share options exercised	$ 831,000
Weighted average remaining contractual life	1 year 2 months 12 days
Aggregate intrinsic values of options outstanding and options exercisable	$ 22,000