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Stockholders' Equity - Summary of Dividends Declared on its Outstanding Shares of Common Stock to its Shareholders (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]                              
Dividends per share declared on outstanding common stock $ 0.27 $ 0.12 $ 0.12 $ 0.12 $ 0.25 $ 0.10 $ 0.10 $ 0.10 $ 0.23 $ 0.10 $ 0.08 $ 0.08 $ 0.63 $ 0.55 $ 0.49
Aggregate amount $ 9,492 $ 4,275 $ 4,283 $ 4,237 $ 8,845 $ 3,429 $ 3,502 $ 3,464 $ 8,134 $ 3,511 $ 2,821 $ 3,259 $ 22,297 [1] $ 19,253 [1] $ 17,754 [1]
[1] See “—Note 8 (Stockholders’ Equity)” for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.