Summary of Difference Between Fair Value of Consideration Transferred and Carrying Amount of Shares that were Redeemed and Exchanged (Parenthetical) (Detail) - $ / shares		6 Months Ended
	Jun. 27, 2018	Jun. 30, 2018
7.75% Series A Cumulative Redeemable Preferred Stock
Temporary Equity [Line Items]
Preferred shares issued, net (shares)	383,147	383,147
Fair value of preferred share price per share	$ 6.52
8.375% Series B Cumulative Redeemable Preferred Stock
Temporary Equity [Line Items]
Preferred shares issued, net (shares)	167,828	167,828
Fair value of preferred share price per share	$ 6.50
8.875% Series C Cumulative Redeemable Preferred Stock
Temporary Equity [Line Items]
Preferred shares issued, net (shares)	117,605	117,605
Fair value of preferred share price per share	$ 6.60