XML 54 R36.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Shareholders' Equity / Partners' Capital (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Equity [Abstract] |
Noncontrolling Interest | The following table summarizes the income or loss allocated to noncontrolling interests as reflected in the Company's consolidated statements of operations for the years ended December 31, 2017, 2016 and 2015 (in thousands):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Preferred income allocated to Series C convertible units | $ | — |  |  | $ | 3,027 |  |  | $ | 18,792 |
Net loss allocated to Class A units | (4,648 | ) |  | (6,417 | ) |  | (4,282 | )
Net income allocated to Series D convertible units | — |  |  | 134 |  |  | — |
Beneficial conversion feature related to Series D and E convertible units | — |  |  | 7,569 |  |  | — |
Net income (loss) allocated to noncontrolling interests in certain consolidated subsidiaries | 141 |  |  | (562 | ) |  | (157 | )
| $ | (4,507 | ) |  | $ | 3,751 |  |  | $ | 14,353 |
Summary of Stock Option Activity Under Plan | The following table summarizes stock option activity under the Plan for the years ended December 31, 2017, 2016 and 2015:
| Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value (1) (in thousands)
Options outstanding at December 31, 2014 | 2,165,000 |  |  | $ | 16.17 |  |  | 8.8 |  | $ | 1,890 |
Granted | 588,500 |  |  | 16.49 |  |  |  |  |  |
Exercised | (16,600 | ) |  | 15.16 |  |  |  |  | 19 |
Forfeited | (252,500 | ) |  | 16.57 |  |  |  |  |  |
Options outstanding at December 31, 2015 | 2,484,400 |  |  | $ | 16.22 |  |  | 8.0 |  | $ | 1,225 |
Granted | 708,000 |  |  | 14.15 |  |  |  |  |  |
Exercised | (196,000 | ) |  | 16.18 |  |  |  |  | 790 |
Forfeited | (169,900 | ) |  | 16.38 |  |  |  |  |
Options outstanding at December 31, 2016 | 2,826,500 |  |  | $ | 15.69 |  |  | 7.6 |  | $ | 14,956 |
Granted | 385,200 |  |  | 23.38 |  |  |  |  |
Exercised | (74,000 | ) |  | 15.65 |  |  |  |  | 520 |
Forfeited | (85,250 | ) |  | 16.24 |  |  |  |  |
Options outstanding at December 31, 2017 | 3,052,450 |  |  | $ | 16.65 |  |  | 6.9 |  | $ | 16,421 |
Options exercisable at December 31, 2017 | 1,782,750 |  |  | $ | 15.92 |  |  | 6.1 |  | $ | 10,558 |
(1) | Intrinsic value for activities other than exercises is defined as the difference between the grant price and the market value on the last trading day of the period for those stock options where the market value is greater than the exercise price. For exercises, intrinsic value is defined as the difference between the grant price and the market value on the date of exercise.
Summary of Black-Scholes Option Pricing Model Inputs Used for Valuation of Stock Options Outstanding | The following table summarizes the Black-Scholes Option Pricing Model inputs used for valuation of the stock options for Class A common shares granted during the years ended December 31, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
Weighted-average fair value | $ | 3.82 |  |  | $ | 2.82 |  |  | $ | 4.57 |
Expected term (years) |  | 7.0 |  |  |  | 7.0 |  |  |  | 7.0 |
Dividend yield |  | 3.0 | % |  |  | 3.0 | % |  |  | 3.0 | %
Volatility |  | 21.3 | % |  |  | 27.3 | % |  |  | 35.9 | %
Risk-free interest rate |  | 2.2 | % |  |  | 1.5 | % |  |  | 1.9 | %
Summary of Restricted Stock Units Activity Under Plan | The following table summarizes the activity that relates to the Company’s restricted stock units under the Plan for the years ended December 31, 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
Restricted stock units at beginning of period | 130,150 |  |  | 91,650 |  |  | 85,000 |
Units awarded | 174,400 |  |  | 74,100 |  |  | 44,000 |
Units vested | (42,475 | ) |  | (27,250 | ) |  | (22,000 | )
Units forfeited | (18,200 | ) |  | (8,350 | ) |  | (15,350 | )
Restricted stock units at end of the period | 243,875 |  |  | 130,150 |  |  | 91,650 |

X
- Definition Noncontrolling Interest [Table Text Block] + References No definition available. + Details
Name: | amh_NoncontrollingInterestTableTextBlock
Namespace Prefix: | amh_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration