Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Schedule of Cash Deposits Subject to Credit Risk (Detail)

v3.8.0.1
Fair Value Measurements - Schedule of Cash Deposits Subject to Credit Risk (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Cash deposits $ 57,274 $ 29,428
Restricted cash deposits (included in other assets) 61,000 30,000
Total cash deposits 118,000 59,000
Amount of cash deposits in excess of amounts federally insured $ 116,000 $ 57,000