Stockholders' Equity - Restricted Stock Vested by or Granted to Non-Executive Directors (Detail) (USD $)	0 Months Ended	3 Months Ended								16 Months Ended	24 Months Ended
	Jul. 23, 2013 Restricted Stock Units (RSUs) [Member] President and Chief Executive Officer [Member]	Sep. 30, 2013 Restricted Stock [Member] Non-executive directors [Member]	Jun. 30, 2013 Restricted Stock [Member] Non-executive directors [Member]	Mar. 31, 2013 Restricted Stock [Member] Non-executive directors [Member]	Dec. 31, 2012 Restricted Stock [Member] Non-executive directors [Member]	Sep. 30, 2012 Restricted Stock [Member] Non-executive directors [Member]	Jun. 30, 2012 Restricted Stock [Member] Non-executive directors [Member]	Mar. 31, 2012 Restricted Stock [Member] Non-executive directors [Member]	Dec. 31, 2011 Restricted Stock [Member] Non-executive directors [Member]	Sep. 30, 2013 Restricted Stock [Member] Non-executive directors [Member]	Sep. 30, 2013 Restricted Stock [Member] Non-executive directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date		Oct. 01, 2014	Jul. 01, 2013	Apr. 01, 2013	Jan. 02, 2013	Oct. 01, 2012	Jul. 02, 2012	Apr. 02, 2012	Jan. 03, 2012
Price Per Share		$ 14.16	$ 13.57	$ 13.27	$ 11.68	$ 11.87	$ 12.86	$ 13.93	$ 13.87	$ 14.16	$ 14.16
Restricted Stock Granted	138,980	6,266	4,606	4,712	5,350	5,263	4,084	3,769	3,785	23,278	37,835
Restricted Stock Vested		0	0	0	0	(4,421)	(4,084)	(3,769)	(3,785)		(16,059)
Vesting Date						Oct. 01, 2013	Jul. 01, 2013	Apr. 01, 2013	Jan. 02, 2013
Restricted Stock Granted and Outstanding		6,266	3,869	3,958	4,494	0	0	0	0		18,587
Cash dividends paid to vested restricted stocks to non-executive directors		$ 0	$ 0	$ 0	$ 0	$ 2,211	$ 2,042	$ 2,356	$ 2,839		$ 9,448