Business Segment Information - Summarized Financial Information of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue from external customers	$ 1,165,864	$ 1,085,814
Net income	78,833	42,046
Domestic Operations
Segment Reporting Information [Line Items]
Revenue from external customers	1,126,523	1,050,883
Net income	75,449	38,833
International Operations
Segment Reporting Information [Line Items]
Revenue from external customers	39,341	34,931
Net income	$ 3,384	$ 3,213