Debt - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Jan. 10, 2012	Mar. 30, 2014	Mar. 31, 2013	Sep. 30, 2012 Swap	Jun. 30, 2012 Swap	Dec. 31, 2013
Debt Disclosure [Abstract]
Revolving credit facility expand	$ 300,000,000
Unsecured revolving credit facility amendment date		Jan. 10, 2012
Percentage of reduced the applicable margin by basis points	0.25%
Revolving Credit Facility Extension Period		Jan. 10, 2017
Revolving credit facility, weighted-average interest rate of 1.9% (2013) and 1.8% (2012), due in 2017		76,600,000				75,000,000
Revolving credit facility current		120,800,000				122,400,000
Standby letters of credit		2,600,000				2,600,000
Percentage of commitment fee		0.25%	0.35%
Number of interest rate swap agreements				4	4
Unrealized loss on cash flow hedges		54,000
Unrealized gain on cash flow hedges			36,000
Realized loss out of other comprehensive income to interest expense		613,000	906,000
Accrued liability		469,000	392,000
Non-current liability		463,000	604,000
Interest Rate Swap [Member]
Debt Disclosure [Abstract]
Amount of swap agreement				25,000,000	50,000,000
Interest Rate Swap [Member] | Realized Loss [Member] | Reclassification out of Accumulated Other Comprehensive Earnings [Member]
Debt Disclosure [Abstract]
Realized loss out of other comprehensive income to interest expense		118,000	77,000
Unsecure revolving credit facility [Member]
Debt Disclosure [Abstract]
Increase in revolving credit facility	200,000,000
Revolving Credit Facility [Member]
Debt Disclosure [Abstract]
Increase in revolving credit facility		200,000,000
Revolving credit facility, weighted-average interest rate of 1.9% (2013) and 1.8% (2012), due in 2017		$ 76,600,000				$ 75,000,000