Equity - Additional Information (Detail) (USD $)	0 Months Ended	6 Months Ended		0 Months Ended	1 Months Ended		6 Months Ended	0 Months Ended	1 Months Ended		6 Months Ended		1 Months Ended
	Jan. 07, 2014	Jan. 31, 2014	Jul. 31, 2013	Jan. 07, 2014 Class A Common Stock [Member]	Dec. 31, 2013 Class A Common Stock [Member]	Jul. 31, 2013 Class A Common Stock [Member]	Jan. 31, 2014 Class A Common Stock [Member]	Jan. 07, 2014 Class B Common Stock [Member]	Dec. 31, 2013 Class B Common Stock [Member]	Jul. 31, 2013 Class B Common Stock [Member]	Jan. 31, 2014 Class B Common Stock [Member]	Jan. 31, 2013 Class B Common Stock [Member]	Aug. 30, 2013 Fabrix [Member]	Aug. 31, 2013 Fabrix [Member]
Equity Textual [Abstract]
Date of declared dividend will be paid							Mar. 28, 2014				Mar. 28, 2014
Dividends payable			$ 1,837,000
Dividends paid	3,900,000
Dividend paid per share				$ 0.17	$ 0.17	$ 0.08	$ 0.17	$ 0.17	$ 0.17	$ 0.08	$ 0.17
Stock repurchase program, shares authorized for repurchase											8,300,000
Purchase of stock of subsidiary		1,133,000											1,100,000
Noncontrolling interests purchased percentage														2.80%
Equity method investment, ownership percentage														88.40%
Stock repurchased in a fiscal year												77,843
Aggregate purchase price of shares repurchased												800,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased											5,100,000
Stockholders' Equity Note, Spinoff Transaction		(1,624,000)
Reduction in exercise price of options outstanding		15.29%
Option to purchase shares in spin-off		32,155
Additional liability		$ 1,700,000