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Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Basic net income (loss) per share attributable to Sterling common stockholders is computed by dividing net income (loss) attributable to Sterling common stockholders by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share attributable to Sterling common stockholders is the same as basic net income (loss) per share attributable to Sterling common stockholders but includes dilutive unvested stock awards and warrants using the treasury stock method. The following table reconciles the numerators and denominators of the basic and diluted per common share computations for net income (loss) attributable to Sterling common stockholders (amounts in thousands, except per share data):
 
 
 
Three Months Ended
March 31,
 
 
2018
 
2017
Numerator:
 
 

 
 

Net income (loss) attributable to Sterling common stockholders
 
$
2,489

 
$
(2,257
)
Weighted average common shares outstanding — basic
 
26,854

 
25,022

Shares for dilutive unvested stock and warrants
 
224

 
—

Weighted average common shares outstanding and incremental shares assumed repurchased— diluted
 
27,078

 
25,022

Basic income (loss) per share attributable to Sterling common stockholders
 
$
0.09

 
$
(0.09
)
Diluted income (loss) per share attributable to Sterling common stockholders
 
$
0.09

 
$
(0.09
)