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Stockholder's Equity	9 Months Ended
	Sep. 30, 2018
Stockholders' Equity Note [Abstract]
Stockholder's Equity	12. Stockholder's Equity  Stock-Based Compensation Sterling has a stock-based incentive plan that is administered by the Compensation Committee of the Board of Directors. Refer to Note 14 of the Notes to Consolidated Financial Statements included in the 2017 Form 10-K for further information. During the three and nine months ended September 30, 2018, the Company awarded, subject to vesting restrictions, a total of 35,464 and 398,936 common stock awards, respectively. The nine months ended September 30, 2018 common stock awards was reduced by 999 shares forfeited during the period and the acceleration of 7,404 unvested shares related to the departure of a former Board of Director member. The Company recorded stock-based compensation expense of $0.8 million and $2.2 million for the three and nine months ended September 30, 2018, respectively. During the three and nine months ended September 30, 2017, the Company awarded, subject to vesting restrictions, a total of 8,000 and 174,410 common stock awards, respectively. The nine months ended September 30, 2017 included costs for the acceleration of unvested shares related to the departure of our former CEO of $0.7 million. The Company recorded stock-based compensation expense of $0.6 million and $2.5 million for the three and nine months ended September 30, 2017, respectively. At September 30, 2018 and 2017, total unrecognized compensation cost related to unvested common stock awards was $5.2 million and $1.1 million, respectively. This cost is expected to be recognized over a weighted average period of 3 years.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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