Shareholders' Equity - Additional Information (Detail) - USD ($)		3 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Equity Class Of Treasury Stock [Line Items]
Options outstanding	0	0
Warrants outstanding	0	0
Other potentially dilutive securities outstanding	0	0
Common Stock
Equity Class Of Treasury Stock [Line Items]
Number of common stock shares repurchased	83,113	19,133
Common Stock | Maximum
Equity Class Of Treasury Stock [Line Items]
Common stock shares repurchase amount			$ 5,000,000