Summary of Significant Accounting Policies - Additional Information (Detail) - Options [Member] - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Summary Of Accounting Policies [Line Items]
Shares excluded from computations of diluted earnings per share	1,864,147	114,270	654,441	130,159
Dilutive effect of common stock equivalent shares using treasury stock method	1,188,189