Capital Stock (Narrative) (Detail) - $ / shares shares in Thousands	Sep. 06, 2018	Sep. 30, 2018	Jun. 30, 2018	May 04, 2017
Dividends Payable [Line Items]
Common stock, shares authorized		75,000	75,000
Preferred stock, shares authorized		2,000	2,000
Dividends declared, per share amount	$ 0.01
Dividends declared, date of declaration	Sep. 06, 2018
Dividend paid, date	Oct. 09, 2018
Dividends payable, date to be paid	Oct. 09, 2018
Dividends declared, date of record	Sep. 24, 2018
Stock repurchase program
Dividends Payable [Line Items]
Number of shares authorized to be repurchased				5,000