Stock-Based Compensation (Deferred and Restricted Stock) - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	0 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended
	Oct. 04, 2014	May 31, 2013 Chief Executive Officer	May 31, 2013 Restricted Stock Award Chief Executive Officer	Oct. 04, 2014 Deferred Stock	Jul. 12, 2014 Deferred Stock Annual Grant Awards Non Employee Directors	Oct. 04, 2014 Deferred Stock Annual Grant Awards Non Employee Directors	Oct. 04, 2014 Deferred Stock Annual Grant Awards Non Employee Directors Minimum	Oct. 04, 2014 Deferred Stock Retainer Conversion	Oct. 04, 2014 Deferred Stock Retainer Conversion Minimum	Oct. 04, 2014 Deferred Stock Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred shares distributed								18,330
Retainers conversion into deferred shares								130.00%
Vesting period							1 year		2 years
Aggregate shares converted					60,300			36,425
Deferred shares distributed				105,621		27,075
Restricted stock award		$ 1.3
Restricted shares issued		58,500
Restricted shares per share			$ 22.25
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP	6.2									2.1
Expected weighted-average period to recognize compensation cost (years)	1 year 1 month 6 days									1 year 7 months 6 days
Award vesting tax windfall										$ 0.6