Shared-Based Compensation - Reconciliation of Restricted Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Restricted Stock
Nonvested Shares (in thousands)
Nonvested restricted shares, beginning balance (in shares) | shares	222,000
Nonvested restricted shares, granted (in shares) | shares	460,255
Nonvested restricted shares, vested (in shares) | shares	(110,000)
Nonvested restricted shares, forfeited (in shares) | shares	(9,000)
Nonvested restricted shares, ending balance (in shares) | shares	563,000
Weighted average grant-date fair value, beginning balance (in dollara per share) | $ / shares	$ 9.33
Weighted average grant-date fair value, granted (in dollars per share) | $ / shares	9.35
Weighted average grant-date fair value, vested (in dollars per share) | $ / shares	9.28
Weighted average grant-date fair value, forfeited (in dollars per share) | $ / shares	9.44
Weighted average grant-date fair value, ending balance (in dollars per share) | $ / shares	$ 9.17
TSR Awards
Nonvested Shares (in thousands)
Nonvested restricted shares, beginning balance (in shares) | shares	65,000
Nonvested restricted shares, granted (in shares) | shares	139,000
Nonvested restricted shares, forfeited (in shares) | shares	(19,000)
Nonvested restricted shares, ending balance (in shares) | shares	185,000
Weighted average grant-date fair value, beginning balance (in dollara per share) | $ / shares	$ 13.27
Weighted average grant-date fair value, granted (in dollars per share) | $ / shares	10.88
Weighted average grant-date fair value, forfeited (in dollars per share) | $ / shares	11.43
Weighted average grant-date fair value, ending balance (in dollars per share) | $ / shares	$ 10.53
ROIC Awards
Nonvested Shares (in thousands)
Nonvested restricted shares, beginning balance (in shares) | shares	79,000
Nonvested restricted shares, granted (in shares) | shares	157,000
Nonvested restricted shares, forfeited (in shares) | shares	(21,000)
Nonvested restricted shares, ending balance (in shares) | shares	215,000
Weighted average grant-date fair value, beginning balance (in dollara per share) | $ / shares	$ 11.50
Weighted average grant-date fair value, granted (in dollars per share) | $ / shares	9.44
Weighted average grant-date fair value, forfeited (in dollars per share) | $ / shares	12.88
Weighted average grant-date fair value, ending balance (in dollars per share) | $ / shares	$ 11.04