Shareholders' Equity (Detail) - Shareholders' equity and noncontrolling interest (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Equity, beginning of period		$ 173,625		$ 173,625
Net income	1,579		6,178	3,967	12,647
Foreign currency translation effect	(43)		(272)	365	(1,243)
Total	1,498		5,960	4,228	11,665
Share based compensation	1,526		1,089	2,756	2,318
Employee Stock Purchase				(15)
Exercise of employee stock options and related tax effect				868	1,221
Purchase of subsidiary shares from noncontrolling interest		3,155
Equity, end of period	178,869			178,869
Parent [Member]
Equity, beginning of period		173,625		173,625	124,720
Net income				3,967	12,647
Foreign currency translation effect				261	(982)
Total				4,228	11,665
Share based compensation				3,988	2,318
Repurchase of restricted stock				(1,078)	(301)
Employee Stock Purchase				15
Exercise of employee stock options and related tax effect				868	1,221
Purchase of subsidiary shares from noncontrolling interest				(2,777)
Equity, end of period	178,869		139,623	178,869	139,623
Noncontrolling Interest [Member]
Equity, beginning of period		2,355		2,355	3,367
Net income				709	1,086
Foreign currency translation effect				104	(261)
Total				813	825
Dividends attributable to noncontrolling interests				(1,101)	(746)
Purchase of subsidiary shares from noncontrolling interest				(378)
Equity, end of period	1,689		3,446	1,689	3,446
Total Equity [Member]
Equity, beginning of period		175,980		175,980	128,087
Net income				4,676	13,733
Foreign currency translation effect				365	(1,243)
Total				5,041	12,490
Share based compensation				3,988	2,318
Repurchase of restricted stock				(1,078)	(301)
Employee Stock Purchase				15
Exercise of employee stock options and related tax effect				868	1,221
Dividends attributable to noncontrolling interests				(1,101)	(746)
Purchase of subsidiary shares from noncontrolling interest				(3,155)
Equity, end of period	$ 180,558		$ 143,069	$ 180,558	$ 143,069