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Selected Quarterly Financial Data (unaudited) - Schedule of Selected Quarterly Statements of Income Data (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, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 65,118 $ 55,340 $ 48,973 $ 55,222 $ 44,040 $ 36,598 $ 33,306 $ 36,985 $ 224,653 $ 150,929 $ 107,601
Operating income 6,234 6,855 10,808 10,538 4,787 4,678 3,094 3,141 34,435 15,700 9,472
Net income (loss) $ 5,157 $ 3,847 $ 5,946 $ 5,995 $ 2,506 $ 2,690 $ (593) $ 1,060 $ 20,945 $ 5,663 $ 607
Net income (loss) per share, basic $ 0.09 $ 0.07 $ 0.10 $ 0.11 $ 0.05 $ 0.05 $ (0.01) $ 0.02 $ 0.37 $ 0.11 $ 0.01
Net income (loss) per share, diluted $ 0.09 $ 0.07 $ 0.10 $ 0.11 $ 0.05 $ 0.05 $ (0.01) $ 0.02 $ 0.36 $ 0.11 $ 0.01
Weighted average shares outstanding:                      
Basic 57,109,987 57,050,684 57,038,021 54,749,951 52,018,730 51,056,462 50,284,362 45,721,584 56,495,170 49,784,154 45,476,895
Diluted 58,365,587 58,367,830 58,369,083 56,562,661 53,855,629 52,978,051 50,284,362 48,371,169 57,919,700 51,857,309 48,062,075