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Related Party Transactions - Additional Information (Detail)									12 Months Ended
	Dec. 29, 2016 $ / shares shares	Aug. 23, 2016 $ / shares shares	Dec. 08, 2015 $ / shares shares	Nov. 30, 2015 $ / shares shares	Aug. 11, 2015 $ / shares shares	Mar. 26, 2015 $ / shares shares	Aug. 14, 2014 $ / shares shares	Mar. 20, 2014 $ / shares shares	Dec. 31, 2016 USD ($) Lease $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Related Party Transaction [Line Items]
Related party transactions number of property leased | Lease									2
Related party transaction lease expenses									$ 300,000	$ 300,000	$ 300,000
Trust [Member]
Related Party Transaction [Line Items]
Purchase of common shares | shares		27,448			30,713		34,106
Common shares price per share | $ / shares		$ 44.66			$ 35.00		$ 54.83
Number of trading days to be considered for average price of stock repurchased		30 days			30 days
Robert G Ruhlman [Member]
Related Party Transaction [Line Items]
Purchase of common shares | shares	5,000		1,510	1,479		1,290		2,098
Common shares price per share | $ / shares	$ 56.38		$ 40.83	$ 41.50		$ 45.39		$ 62.99
Number of trading days to be considered for average price of stock repurchased	30 days		30 days	30 days		30 days		30 days
Ryan Ruhlman [Member]
Related Party Transaction [Line Items]
Compensation payment received										$ 189,870	153,273
Ryan Ruhlman employee years of service										11 years
Compensation attributable to stock option										$ 33,725	39,100
X Information Technology [Member]
Related Party Transaction [Line Items]
Service expense									100,000	200,000	100,000
Flex Work Sp [Member]
Related Party Transaction [Line Items]
Labor expense									$ 400,000	$ 400,000	$ 400,000
Ownership percentage owned by related party									50.00%
Baker & Hostetler LLP [Member]
Related Party Transaction [Line Items]
Legal fees									$ 210,000
Officers and Other Employees [Member]
Related Party Transaction [Line Items]
Purchase of common shares | shares									7,703
Number of trading days to be considered for average price of stock repurchased									30 days
Officers and Other Employees [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Common shares price per share | $ / shares									$ 42.10
Officers and Other Employees [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Common shares price per share | $ / shares									$ 45.20

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