Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Equity [Line Items]
Repurchase of Company stock for retirement		$ 24,811,000
Cash Dividend on Common Stock		$ 3.00	$ 2.70	$ 2.20
Aggregated Dividend Paid		$ 153,000,000	$ 138,400,000	$ 112,000,000
Minimum percentage of adjusted funds from operations as cash dividend		50.00%
Percentage of REIT taxable income as cash dividend		100.00%
2015 Stock Repurchase Program [Member]
Schedule Of Equity [Line Items]
Authorized amount for share repurchase program		$ 100,000,000
Company repurchased, shares	0.5
Repurchase of Company stock for retirement	$ 24,800,000