Shareholders' Equity (Detail) - Shareholders' equity and noncontrolling interest (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Equity, beginning of period				$ 173,625
Net income	1,366		5,407	5,333	18,054
Foreign currency translation effect	(623)		236	(258)	(1,007)
Total	768		5,541	4,996	17,206
Share-based compensation	1,479		1,014	4,235	3,332
Employee stock purchase				(40)
Exercise of employee stock options and related tax effect				1,066	2,882
Purchase of subsidiary shares from noncontrolling interest		3,155
Equity, end of period	180,394			180,394
Parent [Member]
Equity, beginning of period				173,625	124,720
Net income				5,333	18,054
Foreign currency translation effect				(337)	(848)
Total				4,996	17,206
Share-based compensation				4,620	3,332
Repurchase of restricted stock				(1,176)	(401)
Employee stock purchase				40
Exercise of employee stock options and related tax effect				1,066	2,882
Purchase of subsidiary shares from noncontrolling interest				(2,777)
Equity, end of period	180,394		147,739	180,394	147,739
Noncontrolling Interest [Member]
Equity, beginning of period				2,355	3,367
Net income				875	1,605
Foreign currency translation effect				79	(159)
Total				954	1,446
Dividends attributable to noncontrolling interests				(1,101)	(2,192)
Purchase of subsidiary shares from noncontrolling interest				(378)
Equity, end of period	1,830		2,621	1,830	2,621
Total Equity [Member]
Equity, beginning of period				175,980	128,087
Net income				6,208	19,659
Foreign currency translation effect				(258)	(1,007)
Total				5,950	18,652
Share-based compensation				4,620	3,332
Repurchase of restricted stock				(1,176)	(401)
Employee stock purchase				40
Exercise of employee stock options and related tax effect				1,066	2,882
Dividends attributable to noncontrolling interests				(1,101)	(2,192)
Purchase of subsidiary shares from noncontrolling interest				(3,155)
Equity, end of period	$ 182,224		$ 150,360	$ 182,224	$ 150,360