Basis of Presentation - Additional Information (Detail) - shares	Mar. 07, 2018	Jun. 30, 2018	Mar. 05, 2018	Feb. 20, 2018
Basis Of Presentation [Line Items]
Stock divided declared		15.00%
Stock Dividend [Member]
Basis Of Presentation [Line Items]
Stock divided declared				15.00%
Additional stock issued as dividend (in shares)	4,397,520
Ariscom [Member]
Basis Of Presentation [Line Items]
Percentage of capital stock acquired			100.00%