Summary of Business Activities - Additional Information (Detail)	Oct. 06, 2015 $ / shares shares	Aug. 28, 2015 $ / shares	Sep. 26, 2015 $ / shares	Jun. 27, 2015 $ / shares
Business Description [Line Items]
Reverse stock split		0.485 for one
Reverse stock split conversion ratio		0.485
Common stock, par value | $ / shares		$ 0.01	$ 0.01	$ 0.01
Subsequent Event [Member] | Common Stock [Member] | IPO [Member]
Business Description [Line Items]
Issuance of common shares	16,675,000
Issuance of common shares	3,897,675
Issuance of common shares, price per share | $ / shares	$ 19.00
Subsequent Event [Member] | Parent Company [Member] | Common Stock [Member] | IPO [Member]
Business Description [Line Items]
Issuance of common shares	12,777,325