Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding-diluted	37,009,746	36,934,210
Operating Partnership Awards Outstanding [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding-diluted	7,997,000	7,873,000