Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail)

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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
Balance as of January 1 $ 146,421 $ 2,929
Goodwill acquired during the period   143,492
Adjustment to preliminary value of goodwill (Note C) (242)  
Balance at end of period $ 146,179 $ 146,421