Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 380,846
Ending Balance	384,200
SMP
Goodwill [Roll Forward]
Beginning Balance	116,003
Ending Balance	119,357
AMS
Goodwill [Roll Forward]
Beginning Balance	217,956
Ending Balance	217,956
MDS
Goodwill [Roll Forward]
Beginning Balance	46,887
Ending Balance	46,887
RTL
Goodwill [Roll Forward]
Goodwill arising from the RTL acquisition	3,354
RTL | SMP
Goodwill [Roll Forward]
Goodwill arising from the RTL acquisition	$ 3,354