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Net Income (Loss) Per Share Attributable to Sterling Common Stockholders (Tables)
 12 Months Ended
Dec. 31, 2017
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 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):

 
Years Ended December 31,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income (loss) attributable to Sterling common stockholders before noncontrolling interest revaluation
$
11,617

 
$
(9,238
)
 
$
(20,402
)
Revaluation of a noncontrolling interest due to a new agreement
—

 
—

 
(18,774
)
 
$
11,617

 
$
(9,238
)
 
$
(39,176
)
Denominator:
 
 
 
 
 
Weighted average common shares outstanding — basic
26,274

 
23,140

 
19,375

Shares for dilutive unvested stock
438

 
—

 
—

Weighted average common shares outstanding and assumed conversions— diluted
26,712

 
23,140

 
19,375

Basic net income (loss) per share attributable to Sterling common stockholders
$
0.44

 
$
(0.40
)
 
$
(2.02
)
Diluted net income (loss) per share attributable to Sterling common stockholders
$
0.43

 
$
(0.40
)
 
$
(2.02
)