Benefit Plans - Summary of Fair Value of Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Nov. 30, 2012
Plan assets
Plan assets	$ 47,416	$ 39,902
Level 1 [Member]
Plan assets
Plan assets	32,649	25,788
Level 2 [Member]
Plan assets
Plan assets	14,767	14,114
Cash and cash equivalents [Member]
Plan assets
Plan assets	931	849
Cash and cash equivalents [Member] | Level 1 [Member]
Plan assets
Plan assets	931	849
Cash and cash equivalents [Member] | Level 2 [Member]
Plan assets
Plan assets
Listed equity securities [Member]
Plan assets
Plan assets	27,663	20,321
Listed equity securities [Member] | Level 1 [Member]
Plan assets
Plan assets	27,663	20,321
Listed equity securities [Member] | Level 2 [Member]
Plan assets
Plan assets
Corporate debt securities [Member]
Plan assets
Plan assets	7,743	8,037
Corporate debt securities [Member] | Level 1 [Member]
Plan assets
Plan assets
Corporate debt securities [Member] | Level 2 [Member]
Plan assets
Plan assets	7,743	8,037
Foreign corporate debt securities [Member]
Plan assets
Plan assets	1,140	345
Foreign corporate debt securities [Member] | Level 1 [Member]
Plan assets
Plan assets
Foreign corporate debt securities [Member] | Level 2 [Member]
Plan assets
Plan assets	1,140	345
U.S. government securities [Member]
Plan assets
Plan assets	4,055	4,618
U.S. government securities [Member] | Level 1 [Member]
Plan assets
Plan assets	4,055	4,618
U.S. government securities [Member] | Level 2 [Member]
Plan assets
Plan assets
Agency mortgage-backed securities [Member]
Plan assets
Plan assets	3,949	3,774
Agency mortgage-backed securities [Member] | Level 1 [Member]
Plan assets
Plan assets
Agency mortgage-backed securities [Member] | Level 2 [Member]
Plan assets
Plan assets	3,949	3,774
Commercial mortgage-backed securities [Member]
Plan assets
Plan assets	1,280	1,419
Commercial mortgage-backed securities [Member] | Level 1 [Member]
Plan assets
Plan assets
Commercial mortgage-backed securities [Member] | Level 2 [Member]
Plan assets
Plan assets	1,280	1,419
Asset-backed securities [Member]
Plan assets
Plan assets	461	524
Asset-backed securities [Member] | Level 1 [Member]
Plan assets
Plan assets
Asset-backed securities [Member] | Level 2 [Member]
Plan assets
Plan assets	461	524
Other [Member]
Plan assets
Plan assets	194	15
Other [Member] | Level 1 [Member]
Plan assets
Plan assets
Other [Member] | Level 2 [Member]
Plan assets
Plan assets	$ 194	$ 15