Acquisitions - Schedule of Proforma Amount on Acquisition Occurred (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2016
Business Combinations [Abstract]
Total revenues	$ 221,061	$ 437,938
Net income	$ 11,305	$ 22,193
Basic earnings per share	$ 0.44	$ 0.86
Diluted earnings per share	$ 0.44	$ 0.86

Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Publisher FASB
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Pro forma diluted earnings per share, which is commonly presented in initial public offerings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 1.B.3)
-URI http://asc.fasb.org/extlink&oid=6784503&loc=d3e463720-122850

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 270
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

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-Publisher FASB
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-Topic 205
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-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5934-122674

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