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Stock Transactions and Unit Redemptions - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2018 USD ($) shares | Mar. 09, 2018 USD ($) | Nov. 30, 2014 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 shares | Aug. 01, 2018 USD ($) | Mar. 31, 2018 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class B common stock |  |  |  |  | 11,036,273 |  |  |
Limited Partnership Units Exchange Ratio |  |  |  | 1 |  |  |  |
Common stock, issued during the period, additional consideration | $ | $ 0 |  |  |  |  |  |  |
Payment percentage of the gross proceeds from the sale of shares |  |  | 2.00% |  |  |  |  |
Stock repurchase program and unit redemption remaining authorized amount | $ |  |  |  | $ 256,691,000 |  |  |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Limited Partnership Units Exchange Ratio | 1 |  |  |  |  |  |  |
Common stock, issued during the period |  |  |  | 0 |  |  |  |
Common stock outstanding |  |  |  | 45,884,380 | 45,884,380 |  |  |
Common stock, shares issued |  |  |  | 45,884,000 | 45,884,000 |  |  |
Common stock value issued | $ |  |  |  | $ 459,000 | $ 459,000 |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class B common stock |  |  |  |  | 11,036,000 |  |  |
Common stock, issued during the period |  |  |  | 212,711 | 26,003,424 | 1,994,670 |  |
Common stock outstanding |  |  |  | 307,915,000 | 291,475,000 |  |  |
Common stock, shares issued |  |  |  | 358,440,000 | 341,745,000 |  |  |
Common stock value issued | $ |  |  |  | $ 3,584,000 | $ 3,417,000 |  |  |
Company's repurchase and additional redemption authority amount | $ |  |  |  |  |  |  | $ 300,000,000.0 |
Stock repurchase program and unit redemption remaining authorized amount | $ |  |  |  | $ 256,700,000 |  |  |  |
Class A Common Stock [Member] | November 2014 Sales Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Maximum number of shares under the controlled equity offering |  |  | 20,000,000 |  |  |  |  |
Class A Common Stock [Member] | CEO Program [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  | 20,000,000 |  | 20,000,000
Class A Common Stock [Member] | New CEO Program [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  | 17,401,431 |  |  |  |
Maximum amount under the controlled equity offering program | $ |  | $ 300,000,000.0 |  |  |  |  |  |
Common stock value issued | $ |  |  |  | $ 209,800,000 |  |  |  |
Cantor [Member] | Class B Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class B common stock | 10,323,366 |  |  |  |  |  |  |
CFGM [Member] | Class B Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class B common stock | 712,907 |  |  |  |  |  |  |
Cantor or CFGM [Member] | Class B Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period, additional consideration | $ | $ 0 |  |  |  |  |  |  |

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