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Condensed Financial Information of the Company - Consolidated Statement of Cash Flows (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Net cash provided by (used in) operating activities ¥ 621,055 $ 95,455 ¥ 397,551 ¥ 948,487
Net cash (used in) provided by investing activities (152,099) (23,378) (982,803) (341,439)
Net cash provided by financing activities 505,428 77,683 103,475 81,627
Effect of exchange rate changes on cash and cash equivalents (67,896) (10,436) 49,544 38,820
Net increase (decrease) in cash and cash equivalents 906,488 139,324 (432,233) 727,495
Cash and cash equivalents at beginning of the year 1,411,000 216,867 1,843,233 1,115,738
Cash and cash equivalents at end of the year 2,317,488 356,191 1,411,000 1,843,233
Parent Company [Member]        
Net cash provided by (used in) operating activities 40,685 6,253 (114,699) 118,281
Net cash (used in) provided by investing activities 265,767 40,848 (437,878) (202,844)
Net cash provided by financing activities 23,929 3,678 11,546 102,366
Effect of exchange rate changes on cash and cash equivalents (31,385) (4,824) 32,145 31,181
Net increase (decrease) in cash and cash equivalents 298,996 45,955 (508,886) 48,984
Cash and cash equivalents at beginning of the year 74,488 11,448 583,374 534,390
Cash and cash equivalents at end of the year ¥ 373,484 $ 57,403 ¥ 74,488 ¥ 583,374